1,1

Amiram Eldar, Table of n, a(n) for n = 1..372

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

a(n) = A057954(2n) - A057954(n). - T. D. Noe, Jun 19 2003

a(n) = A001222(A034491(n)). - Amiram Eldar, Feb 02 2020

PrimeOmega[Table[7^n + 1, {n, 1, 30}]] (* Amiram Eldar, Feb 02 2020 *)

(MAGMA) f:=func<n|&+[p[2]: p in Factorization(n)]>; [f(7^n + 1):n in [1..110]]; // Marius A. Burtea, Feb 02 2020

Cf. A057934-A057941, A054992.

Cf. A001222, A034491, A057954.

Sequence in context: A062366 A278635 A294656 * A080216 A082924 A159636

Adjacent sequences: A057934 A057935 A057936 * A057938 A057939 A057940

nonn

Patrick De Geest, Oct 15 2000

approved