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Search: id:A118223
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| A118223 |
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Numbers n such that n! * p(n)# - 1 is prime. |
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+0
2
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| 2, 3, 4, 9, 11, 12, 13, 50, 73, 81, 82, 115, 308, 405
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Fourteen terms found and primes proved by PrimeForm ([N+1, Brillhart-Lehmer-Selfridge]). There are no more terms <= 2100.
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EXAMPLE
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3 is a term as 3! * p(3)# - 1 = 3*2*1 * 5*3*2 - 1 = 179, a prime.
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CROSSREFS
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Cf. A118222.
Sequence in context: A076963 A081871 A068334 this_sequence A093514 A080231 A125774
Adjacent sequences: A118220 A118221 A118222 this_sequence A118224 A118225 A118226
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KEYWORD
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nonn
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AUTHOR
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Rick L. Shepherd (rshepherd2(AT)hotmail.com), Apr 16 2006
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