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13

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Origin 1908 to 1965

Thirteen carries a divided reputation, feared in Western superstition as an unlucky number yet honored in many older traditions as a number of transformation and rebirth, tied to the thirteen lunar months and the cycles of the goddess and the moon. Made of one and three, it joins the initiative of the one with the creativity of the three and reduces to the root vibration four, the essence of structure and work, so that its upheavals are meant to build something more solid. In tarot it is Death, card thirteen, which almost never means literal death but rather profound change, the ending that clears the way for renewal. Its keywords are transformation, endings and beginnings, upheaval, and regeneration. As a compound number thirteen channels disruptive change through the grounding vibration of four, breaking down the old to lay a stronger foundation, the number of necessary metamorphosis rather than misfortune.

Facts
Origins
Origin Period
1908 to 1965 1Tradition: Modern name numerology (Mrs. L. Dow Balliett and her successors)
Origin Period
500 BCE to 300 CE 2Tradition: Pythagorean and Neopythagorean number lore
Origin Period
The arithmological reading of the first numbers, one as source, two as division, four as justice, seven as virgin, ten as completion, reaches us through Platonic and Neopythagorean writers of the centuries after Plato. Burkert's finding is that it cannot be traced to Pythagoras himself, whose activity was religious rather than mathematical: the doctrines were credited backwards to him. 2
Origin Period
The system that gives a number a personality, and a person a number, was assembled in the United States in the first half of the twentieth century out of New Thought material. Balliett's The Philosophy of Numbers appeared in 1908; the chart positions, pinnacles and cycles were added by her successors over the next fifty years. 1
Place of Origin
The Greek world, and above all the Greek cities of southern Italy where the Pythagorean societies were established; the arithmological literature itself is later and largely eastern Mediterranean. 2Tradition: Pythagorean and Neopythagorean number lore
Place of Origin
The United States, and specifically the New Thought circuit of the north-eastern seaboard; Balliett worked from Atlantic City. 1Tradition: Modern name numerology (Mrs. L. Dow Balliett and her successors)
Attributed Author / Compiler
Attributed by the tradition to Pythagoras. Burkert's study is the standard demonstration that the number-doctrines carrying his name are the work of later hands, and that almost nothing in them can be shown to go back to the sixth century BCE. The attribution is recorded because it is what the tradition says, not because it holds. 2Tradition: Pythagorean and Neopythagorean number lore
Attributed Author / Compiler
Mrs. L. Dow Balliett, who published the first version of the modern system in 1908 and to whom Dudley devotes a chapter. What later authors added, the pinnacles, the challenges, the cycles, the personal year, is theirs, and this atlas's own numerology-position entries cite four different authors between 1908 and 1965 for what is presented as one system. 1Tradition: Modern name numerology (Mrs. L. Dow Balliett and her successors)
Origin of the Name
Pythagorean numerology is a twentieth-century label. The system it names has no demonstrable descent from Pythagoras, from the Pythagorean societies, or from the ancient arithmological literature; the letter-value chart it rests on was drawn up in the United States after 1900. The name borrows a pedigree, the oldest move in the subject. 1Tradition: Modern name numerology (Mrs. L. Dow Balliett and her successors)
Attestation
Meaning in the Attesting Source
In Snorri Sturluson's account of Baldr's death, the Aesir are feasting in Valhalla when Loki arrives uninvited among them, and it is Loki who engineers Baldr's killing before the feast ends. Folklore scholarship widely cites this scene, a gathering of twelve gods disrupted by an uninvited thirteenth arrival that brings death, as a second, independent root of the number's ill omened reputation alongside the Christian one. 3Tradition: Norse mythology (Prose Edda, Loki as the uninvited guest at the feast before Baldr's death)
Meaning in the Attesting Source
Matthew places Jesus reclining at table with the twelve for the Last Supper, making thirteen people present with Judas Iscariot, who would betray him, among them. The long standing Western association of thirteen with bad luck is widely traced to this scene, a thirteenth guest whose presence turned out to foretell death. 4Tradition: Christian folk tradition (thirteen at the Last Supper)
Status
Standing as a Comparative Category
Largely abandoned as a comparative category 1
Modern Numerology
Reduction in the Modern System
The modern system reduces every number above nine by adding its digits: 1 + 3 = 4. Whatever the system says of 13 it therefore says of 4, which its own description already states directly ("reduces to the root vibration four"), because it holds no separate doctrine for the higher numbers. The stated exceptions are 11, 22 and 33, which it leaves unreduced and calls master numbers. 1
Contested Use
Contested or Appropriated Modern Use
Numerology has been sold since Balliett as a basis for decisions: which name to take, which date to marry on, which house number to buy. Dudley's survey of what numerologists sell is the standard critical account and its finding is blunt, numbers have power over minds, not over events. These entries record what the tradition says, not advice. 1
Learn More
How Thirteen Became Unlucky

Thirteen is the sixth prime, a Fibonacci number, and the sum of the squares 4 and 9. It is also the most famous unlucky number in the Western world, and that reputation is far younger than almost everyone assumes.

There is no good evidence of a widespread fear of thirteen before the modern period. The word triskaidekaphobia was coined only in 1911. The two explanations most often given are both later rationalisations. The first is the Last Supper, thirteen at table with the betrayer among them; the superstition about thirteen dining together is attested in the eighteenth century and the scriptural justification appears alongside it rather than before it. The second is Loki arriving as the thirteenth guest at a feast in Valhalla and bringing about the death of Baldr. That story is not in the Poetic or Prose Edda in that form. The thirteenth-guest detail is a nineteenth-century embellishment, and it circulates now as though it were Norse.

Friday the thirteenth is younger still. Fridays were unlucky and thirteen was unlucky, but the combination is not attested before the nineteenth century, and it was pushed into general awareness by Thomas W. Lawson's novel Friday, the Thirteenth in 1907, about a broker who exploits the superstition to crash the market. The explanation that it commemorates the arrest of the Knights Templar on Friday 13 October 1307 is a twentieth-century invention that appears in no earlier source and should be treated as false rather than merely doubtful.

What is genuinely old is the discomfort of a number that follows a very useful one. Twelve organises the year, the circle and the trading systems; thirteen is what is left over, and its unluckiness is best understood as the unluckiness of the remainder.

Thirteen in the Calendar and in Mesoamerica

Where thirteen is treated positively, it is usually because a calendar put it there.

A solar year contains twelve lunations with eleven days to spare, so roughly every third year a lunisolar calendar needs a thirteenth month. That intercalated month is the practical origin of much of thirteen's association with disruption and with the moon; it is the month that does not belong.

The strongest positive tradition is Mesoamerican. The 260-day ritual count, the tzolk'in of the Maya and the tonalpohualli of the Aztec, pairs a cycle of thirteen numbers with a cycle of twenty named days, and 13 x 20 = 260 gives the period. The thirteen-day unit, the trecena, is the working week of that calendar, each with its own patron deity and character, and divinatory almanacs are organised by it. Maya cosmology also gives thirteen levels to the upper world against nine to the underworld. None of this carries any suggestion of misfortune; thirteen there is a structural number on a level with twelve elsewhere.

Where the 260-day count itself comes from is genuinely unresolved. Proposals include the human gestation period, the interval between zenith passages of the sun at certain Mesoamerican latitudes, and the cycle of Venus, and none has become consensus. The 260-day period fits together with the 365-day year to give the fifty-two year Calendar Round, and that much is arithmetic rather than interpretation.

Elsewhere thirteen is thin. Its appearance in the American seal, thirteen stripes, thirteen stars, thirteen arrows, counts the founding states and nothing more, though it has attracted a large and entirely modern conspiratorial literature.

Correspondences & Relations

Numerology Meanings

Birthday Gift, Numerology Positions

Born on the thirteenth, the root is four and the compound carries the number's inherited reputation. The tradition splits here: some of the literature reads thirteen as an unfortunate compound demanding extra effort for its results, others read it as transformation and hard-won mastery. Both readings agree the gift involves work that others would not undertake.

Cross-Tradition Connections

Disciplines That Use This

Numerology, Disciplines

The modern numerological system assigns this number a meaning, which is why the atlas records it as a subject in its own right, though this does not endorse what the discipline says about it. This link shows only that the discipline works with this particular number; the readings of the number itself belong to whichever tradition holds them.

Source Numerology: Or, What Pythagoras WroughtUnderwood Dudley
Sources
1. Numerology: Or, What Pythagoras Wrought
Underwood Dudley, Mathematical Association of America (Spectrum series), 1997on the pedigree claimed for modern numerologyView the Source
2. Weisheit und Wissenschaft: Studien zu Pythagoras, Philolaos und Platon (Lore and Science in Ancient Pythagoreanism)
Walter Burkert, Harvard University Press, 1962the chapters on Pythagoras and on Pythagorean number theoryView the Source
3. The Prose Edda
Snorri Sturluson, The American-Scandinavian Foundation, 1916View the Source
4. The New Testament, Gospel of Matthew
Anonymous
The Mystery of Numbers
Annemarie Schimmel, Oxford University Press, 1993s.v. thirteenView the Source
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