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Search: id:A053982
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| A053982 |
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Numbers n such that 1 + product of first n composite numbers is prime. |
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+0
2
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| 1, 3, 7, 11, 16, 22, 39, 76, 116, 139, 149, 169, 179, 220, 372, 429, 1216
(list; graph; listen)
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OFFSET
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1,2
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MATHEMATICA
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Composite[n_Integer] := (k = n + PrimePi[n] + 1; While[k - PrimePi[k] - 1 != n, k++ ]; k); Do[ If[ PrimeQ[ Product[ Composite[k], {k, 1, n} ] + 1], Print[ n ] ], {n, 1, 430} ]
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CROSSREFS
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Cf. A002808, A000040, A057017.
Sequence in context: A118027 A082644 A131024 this_sequence A118000 A121640 A112786
Adjacent sequences: A053979 A053980 A053981 this_sequence A053983 A053984 A053985
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KEYWORD
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nonn
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AUTHOR
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G. L. Honaker, Jr. (honak3r(AT)bvunet.net), Apr 02 2000
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EXTENSIONS
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More terms from Jeppe Stig Nielsen (sequence(AT)jeppesn.dk), Apr 16 2000 (from 76 on these may be only pseudoprimes). 429 and 1216 from Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 20 2001
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