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A033932 Least positive a(n) such that n!+a(n) is prime. +0
3
1, 1, 1, 1, 5, 7, 7, 11, 23, 17, 11, 1, 29, 67, 19, 43, 23, 31, 37, 89, 29, 31, 31, 97, 131, 41, 59, 1, 67, 223, 107, 127, 79, 37, 97, 61, 131, 1, 43, 97, 53, 1, 97, 71, 47, 239, 101, 233, 53, 83, 61, 271, 53, 71, 223, 71, 149, 107, 283, 293, 271, 769, 131, 271 (list; graph; listen)
OFFSET

0,5

COMMENT

Conjecture: No term is a composite number. a(n)is a prime > 3*prime(k) where prime(k) < n = < prime(k+1). - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 07 2004

LINKS

T. D. Noe, Table of n, a(n) for n=0..500

Index entries for sequences related to factorial numbers

PROGRAM

(PARI) for(n=0, 70, k=1; while(!isprime(n!+k), k++); print1(k, ", "))

CROSSREFS

Cf. A033933.

Sequence in context: A078496 A114521 A159482 this_sequence A144186 A153979 A126992

Adjacent sequences: A033929 A033930 A033931 this_sequence A033933 A033934 A033935

KEYWORD

nice,nonn

AUTHOR

Jeff Burch (gburch(AT)erols.com)

EXTENSIONS

More terms from Jud McCranie (j.mccranie(AT)comcast.net). a(21) onwards from wouter.meeussen(AT)pandora.be. Better description from Rick L. Shepherd (rshepherd2(AT)hotmail.com), Nov 06 2002

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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