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Pattern
Identical digits
Five of a kind
Four of a kind
Three of a kind
Double pair
One repeated digit
Adjacent digit run
Two-digit alphabet
Palindrome
Ascending sequence
Descending sequence
Ascending segment
Descending segment
ABAB pattern
ABCABC pattern
Alternating parity
Zigzag digits
Harshad number
Happy number
Prime number
Semiprime
Perfect square
Perfect cube
Power of two
Fibonacci number
Triangular number
Factorial
Highly divisible
Binary palindrome
Binary repunit
Hexadecimal repdigit
Minimum digits
1
2
3
4
5
6
7
Minimum digit sum
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