Patterns /Repetition
Numbers Built From Two Digits
These numbers use only two different digits across four or more places, like 9119 or 303033. The whole number is drawn from a two-symbol alphabet.
How long might numbers built from two digits take?
1 in 232.9 per roll · 233 rolls on average.
At one daily specimen a day, the mean is about 0.6 years. A 50% chance takes 162 rolls; 90% takes 536.
7 daily rolls
2.97%
30 daily rolls
12.11%
365 daily rolls
79.21%
12.11% chance of at least one match in 30 independent rolls.
Waiting times are averages, not deadlines. Previous misses do not increase the next roll’s chance. Only Daily Specimens stamp your Atlas.
Restricting a six-digit number to two symbols cuts the available combinations dramatically — from a million arrangements down to a few dozen per digit pair. That collapse is exactly what the count above measures.
This trait is about vocabulary rather than structure. It does not care whether the two digits alternate, cluster or scatter; alternation is picked up separately by the ABAB and alternating-parity traits.
Two-digit numbers in this sense frequently overlap with palindromes and ABAB patterns. Since those live in other groups, a number like 101101 collects contributions from several directions at once.
Highest-scoring examples
The best-scoring numbers of four digits or more that carry this pattern. Shorter numbers are excluded here because their length alone dominates any score ranking.
Smallest examples
The first numbers in the range that match this pattern.
Related repetition patterns
Repeating Digit Numbers
A repdigit is a number whose digits are all the same, such as 7, 77, 777 or 444444. They are among the rarest visual patterns because every digit is locked to one value.
Five or More of One Digit
Five of a kind: one digit appears at least five times in the number, as in 888880 or 292222. Only six-digit numbers can reach this without being a full repdigit.
Quadruple Digits
A quadruple number contains exactly four copies of one digit, like 4441 or 727772. Four of a kind is the point where repetition stops looking like coincidence.
Triple Digits
A triple contains exactly three copies of one digit, such as 8188 or 636306. It is the most common form of strong repetition — and the first one most people notice.
Double Pair Numbers
A double pair has two different digits appearing twice each, like 3388 or 271721. It is the digit equivalent of two pair in poker.