1892100

Appears in sequences

• Numbers n such that 2n-1, 4n-1, 8n-1, 16n-1, 32n-1 and 64n-1 are primes.at n=19A125113
• a(n) = (n^2 - 3*n + 6)*binomial(n+2,3)/4.at n=34A301973