271770

Appears in sequences

• Numbers k such that k-17, k-1, k+1 and k+17 are consecutive primes.at n=9A262176
• a(n) = [x^n] Product_{k=1..n} (1 + k*x)/(1 - k*x).at n=5A350366
• Square array A(n,k), n>=0, k>=0, read by antidiagonals downwards, where column k is the expansion of Product_{j=0..k} (1 + j*x)/(1 - j*x).at n=60A383900