A033561 Primes p such that 6!+p is also prime.

7, 13, 19, 23, 31, 37, 41, 53, 67, 89, 101, 103, 107, 109, 137, 139, 157, 163, 167, 191, 199, 227, 233, 251, 257, 263, 271, 277, 293, 311, 313, 331, 349, 367, 373, 383, 389, 397, 409, 431, 433, 443, 461, 467, 503, 509, 557, 563, 569, 571, 577, 587, 599, 601, 607

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from Vincenzo Librandi)

Mathematica

Select[Prime[Range[800]], PrimeQ[# + 720]&] (* Vincenzo Librandi, Apr 10 2013 *)

Prog

(Magma) [p: p in PrimesUpTo(800)|IsPrime(p+720)]; // Vincenzo Librandi, Apr 10 2013
(PARI) isok(k) = isprime(k) && sigma(k + 720) == sigma(k) + 720; \\ Amiram Eldar, Mar 08 2025

Crossrefs

Cf. A054984.

Sequence in context: A088982 A354460 A176406 * A227030 A049591 A176180

Adjacent sequences: A033558 A033559 A033560 * A033562 A033563 A033564

Keyword

nonn,easy

Author

Jeff Burch

Status

approved