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Search: id:A139199
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| A139199 |
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Numbers k such that (k!-4)/4 is prime. |
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+0
1
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| 4, 5, 6, 7, 8, 10, 15, 18, 23, 157, 165, 183, 184, 362, 611, 908
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Numbers k such that (k!-m)/m is prime:
for m=1 see A002982
for m=2 prime or pseudoprime see A082671
for m=3 see A139056
for m=4 see A139199
for m=5 see A139200
for m=6 see A139201
for m=7 see A139202
for m=8 see A139203
for m=9 see A139204
for m=10 see A139205
a(17) > 2000 [From Ray G. Opao (qzxpqbp(AT)gmail.com), Sep 30 2008]
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MATHEMATICA
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a = {}; Do[If[PrimeQ[(n! - 4)/4], Print[a]; AppendTo[a, n]], {n, 1, 184}]; a (*Artur Jasinski*)
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CROSSREFS
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Cf. A139189, A139190, A139191, A139192, A139193, A139194, A139195, A139196, A139197, A139198.
Adjacent sequences: A139196 A139197 A139198 this_sequence A139200 A139201 A139202
Sequence in context: A023373 A078778 A037356 this_sequence A003666 A047314 A039040
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KEYWORD
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hard,more,nonn,new
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 11 2008
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EXTENSIONS
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a(15)-a(16) from Ray G. Opao (qzxpqbp(AT)gmail.com), Sep 30 2008
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