A139068 Primes of the form k!/9 + 1.

4481, 611402462201343216650033936533361654773516861440000000001, 234195255375503079690400057633265510581087082006817356924774723468294901747510352675631491470712754833859385753600000000000000000001

Offset

1,1

Comments

For numbers k for which (9+k!)/9 is prime see A137390.

Links

Amiram Eldar, Table of n, a(n) for n = 1..9

Formula

a(n) = A139156(A137390(n)). - Amiram Eldar, Oct 14 2024

Mathematica

a = {}; Do[If[PrimeQ[(n! + 9)/9], AppendTo[a, [(n! + 9)/9]], {n, 1, 150}]; a
Select[Range[100]!/9+1, PrimeQ] (* Harvey P. Dale, Aug 17 2017 *)

Prog

(PARI) for(n=6, 1e4, if(ispseudoprime(t=n!/9+1), print1(t", "))) \\ Charles R Greathouse IV, Jul 15 2011

Crossrefs

Cf. A020458, A007749, A082672, A089085, A089130, A117141, A137390, A139056, A139057, A139058, A139059, A139060, A139061, A139062, A139063, A139064, A139065, A139066, A137390, A139070, A139071, A139072, A139156.

Sequence in context: A235890 A237775 A179161 * A232200 A345600 A345859

Adjacent sequences: A139065 A139066 A139067 * A139069 A139070 A139071

Keyword

nonn

Author

Artur Jasinski, Apr 07 2008

Status

approved