A067832 Primes p such that sigma(p-6) > p.

41, 61, 71, 83, 97, 101, 127, 131, 139, 149, 151, 167, 181, 191, 193, 211, 223, 227, 241, 251, 271, 281, 293, 307, 311, 331, 347, 349, 367, 383, 397, 401, 409, 419, 421, 431, 433, 443, 457, 461, 479, 487, 491, 499, 503, 521, 523, 541, 557, 571, 587, 601

Offset: 1

Author

Benoit Cloitre, Feb 08 2002

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000203, A067831.

Programs

Mathematica

Select[Prime[Range[3,150]],DivisorSigma[1,#-6]>#&] (* Harvey P. Dale, Jul 01 2017 *)

PARI

isok(p) = p > 6 && isprime(p) && sigma(p-6) > p; \\ Amiram Eldar, Apr 24 2025