The pattern library
Fourteen ways a number can be special. Each page has the exact count, the score math, and the highest-scoring examples in the whole range.
- Palindrome NumbersThe same story told forwards and backwards.1,989 matches →
- Repeating Digit NumbersOne digit, committed to the bit.35,929 matches →
- Ascending Sequence NumbersDigits that only know one direction: up.1,887 matches →
- Descending Sequence NumbersEvery digit one step closer to the floor.1,988 matches →
- Zigzag NumbersUp, down, up, down — never twice in the same direction.136,425 matches →
- ABAB & ABCABC PatternsNumbers with a chorus that repeats.1,071 matches →
- Prime NumbersDivisible by nothing. Impressed by no one.78,498 matches →
- Perfect Square NumbersNumbers that fit in a square grid, exactly.1,001 matches →
- Fibonacci NumbersEach one is the sum of the two before it.30 matches →
- Harshad NumbersDivisible by the sum of their own digits.95,428 matches →
- Happy NumbersNumbers that eventually reach joy (the number 1).143,071 matches →
- Powers of TwoThe binary aristocracy: 1, 2, 4, 8, 16…20 matches →
- Triangular NumbersStack the dots: 1, 3, 6, 10, 15…1,414 matches →
- Meme & Named NumbersNumbers the internet gave a name to.12 matches →