30684

Appears in sequences

• Numbers n such that 39*2^n-1 is a prime.at n=16A050545
• Triangle, read by rows, equal to the matrix inverse of R=A113389.at n=22A114159
• a(n) = sum of all divisors of all positive integers <= prime(n).at n=43A244583
• a(n) = 4*(23 - 17*n + 8*n^2).at n=31A387458