31359

Appears in sequences

• a(1) = 5, a(n) = concatenation of two closest factors of a(n-1) whose product equals a(n-1) or if a(n-1) is a prime then the concatenation of 1 and a(n-1).at n=7A063382
• a(n) = 40*n^2 - 1.at n=27A158598