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A139060
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Primes of the form (4+k!)/4.
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43
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7, 31, 181, 1556755201, 12772735542927360001, 3877802510832746496000001, 65782709233423382541804503040000001, 203978820811974433586402817399028973568000000001
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Numbers k for which (4+k!)/4 is prime see A139061
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MATHEMATICA
| a = {}; Do[If[PrimeQ[(n! + 4)/4], AppendTo[a, (n! + 4)/4]], {n, 1, 50}]; a
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PROG
| (PARI) for(k=4, 1e3, if(ispseudoprime(t=k!/4+1), print1(t", "))) \\ Charles R Greathouse IV, Jul 15 2011
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CROSSREFS
| Cf. A082672, A089085, A089130, A117141, A007749, A139056, A139057, A139058, A139059, A139060, A139061, A139061, A139062, A139063, A139064, A139065, A139066, A020458.
Sequence in context: A188233 A172634 A139151 * A155521 A201116 A060015
Adjacent sequences: A139057 A139058 A139059 * A139061 A139062 A139063
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 07 2008
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