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Search: id:A057738
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| A057738 |
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Primes p such that 3^p + 2 is prime. |
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+0
2
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OFFSET
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1,1
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COMMENT
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Next term, if exists, is bigger than 5000. - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Mar 18 2006
If it exists, the next term is greater than 32500. - Bernardo Boncompagni (redgolpe(AT)redgolpe.com), Dec 18 2007
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 139, p. 48, Ellipses, Paris 2008.
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EXAMPLE
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a(2) = 3 because 3^3 + 2 = 29 is prime.
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MATHEMATICA
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For[n = 1, n < 700, n++, If[PrimeQ[3^Prime[n] + 2], Print[Prime[n]]]] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Mar 18 2006
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CROSSREFS
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Cf. A057739.
Sequence in context: A010343 A118169 A066908 this_sequence A042073 A124236 A042369
Adjacent sequences: A057735 A057736 A057737 this_sequence A057739 A057740 A057741
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KEYWORD
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more,nonn,bref
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AUTHOR
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G. L. Honaker, Jr. (honak3r(AT)gmail.com), Oct 29 2000
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