1,1

Amiram Eldar, Table of n, a(n) for n = 1..451

S. S. Wagstaff, Jr., The Cunningham Project

a(n) = A057956(2n) - A057956(n). - T. D. Noe, Jun 19 2003

a(n) = A001222(A034474(n)). - Amiram Eldar, Feb 01 2020

PrimeOmega[5^Range[100]+1] (* Harvey P. Dale, Nov 27 2013 *)

Cf. A057934-A057941, A054992.

Cf. A001222, A034474, A057956.

Sequence in context: A238745 A092607 A221861 * A163371 A061338 A135714

Adjacent sequences: A057936 A057937 A057938 * A057940 A057941 A057942

nonn

Patrick De Geest, Oct 15 2000

approved