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A125174 Primes of the form n! + (n+1)! - 1. 0
2, 7, 29, 839, 3991679, 93405311999, 1394852659199, 6758061133823999, 315777214062132212662271999999, 9146650338351415815045119999999, 303916116658416027343136804044799999999 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

0!+1!-1 = 1 is not prime, 1!+2!-1 = 2 is prime, 2!+3!-1 = 7 is prime, 3!+4!-1 = 29 is prime, 4!+5!-1 = 143 = 11*13 is not prime.

PROG

(PARI) for(n=0, 35, if(isprime(a=n!+(n+1)!-1), print1(a, ", ")))

CROSSREFS

Cf. A118913 (primes of the form n! + (n+1)! + 1).

Sequence in context: A270518 A094475 A093034 * A270526 A037417 A042913

Adjacent sequences:  A125171 A125172 A125173 * A125175 A125176 A125177

KEYWORD

nonn

AUTHOR

Tomas Xordan, Jan 12 2007

EXTENSIONS

Edited and extended by Klaus Brockhaus, Jan 24 2007

STATUS

approved

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Last modified March 25 12:11 EDT 2019. Contains 321470 sequences. (Running on oeis4.)