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Search: id:A156167
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| A156167 |
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Numbers n such that n![7]-1 is prime (n![7] = A114799(n) = septuple factorial). |
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+0
2
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| 3, 4, 6, 8, 9, 10, 11, 12, 14, 17, 20, 24, 30, 31, 32, 46, 52, 54, 59, 98, 104, 143, 145, 160, 174, 198, 199, 202, 212, 215, 254, 371, 382, 452, 674, 739, 959, 1249, 1657, 2291, 2553, 2650
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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C. Caldwell, H. Dubner (Eds): The top ten prime numbers: from the unpublished collections of R. Ondrejka (May 2001), Table 21 F, p. 75
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PROGRAM
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(PARI) mf(n, k=7)=prod(i=0, (n-2)\k, n-i*k)
for( n=1, 9999, ispseudoprime(mf(n)-1) & print1(n", "))
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CROSSREFS
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cf. A156165, A051592, A085149, A085147, A084438, A007749, A002982.
Sequence in context: A099356 A121543 A080702 this_sequence A090864 A118300 A134745
Adjacent sequences: A156164 A156165 A156166 this_sequence A156168 A156169 A156170
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KEYWORD
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more,nonn
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AUTHOR
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M. F. Hasler (MHasler(AT)univ-ag.fr), Feb 10 2009
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