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Search: id:A100599
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| A100599 |
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Numbers n such that (prime(n)-1)! + prime(n)^7 is prime. |
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1
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OFFSET
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1,1
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COMMENT
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n={7, 14, 16, 59} yields primes p(n)={17, 43, 53, 277}. There are no more such n up to n=100. Computed in collaboration with Ray Chandler.
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LINKS
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J. V. Post, Math Pages.
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FORMULA
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Numbers n such that (prime(n)-1)! + prime(n)^7 is prime, where prime(n) is the n-th prime.
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EXAMPLE
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a(7) = 7 because (prime(7)-1)! + prime(7)^7 = (17-1)! + 17^7 = 20923200226673 is the smallest prime of that form.
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MATHEMATICA
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lst={}; Do[p=Prime[n]; If[PrimeQ[(p-1)!+p^7], AppendTo[lst, n]], {n, 10^2}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 08 2008]
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CROSSREFS
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Cf. A100858.
Sequence in context: A115770 A086779 A167197 this_sequence A118905 A092433 A056203
Adjacent sequences: A100596 A100597 A100598 this_sequence A100600 A100601 A100602
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Nov 30 2004
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