42755

Appears in sequences

• Numbers k such that k*(k+3) gives the concatenation of two numbers m and m+9.at n=2A116349
• Starts of record-length runs of consecutive positive integers with the same value of A071626.at n=18A357387
• a(n) is the smallest positive integer which can be represented as the sum of n distinct nonzero square pyramidal numbers in exactly n ways, or -1 if no such integer exists.at n=22A360218