81487

Appears in sequences

• Integers n such that 8*10^n+21 is prime.at n=16A111022
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-2.at n=27A211958
• a(n) = n^3 + (n+1)*(n+2).at n=43A270109