109278

Appears in sequences

• Triangular numbers whose digits can be rearranged to form a substring of 123456789012345678901234....at n=20A068804
• Triangular numbers for which the sum of the digits equals the sum of the digits of the next triangular number.at n=22A117511
• Triangular numbers for which the sum of the digits is a cube.at n=33A117803
• Triangular numbers which have one or more occurrences of exactly six different digits.at n=5A241789
• Hexagonal numbers (A000384) in which parity of digits alternates.at n=23A297645
• The first of two consecutive triangular numbers the sum of which is equal to the sum of two consecutive prime numbers.at n=30A298462
• Semiperimeter of the unique primitive Pythagorean triple whose inradius is A000045(n) and such that its long leg and its hypotenuse are consecutive natural numbers.at n=13A382609
• Number of binary strings of length n that contain at least one maximal run of ones of even length.at n=17A387332