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Search: id:A123983
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| A123983 |
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Numbers n for which 8n+1, 8n+5, 8n+7 and 8n+11 are primes. |
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+0
1
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| 12, 57, 162, 249, 432, 564, 984, 1734, 2007, 2427, 2664, 2784, 3627, 5307, 5472, 5727, 6399, 7614, 11082, 11547, 11607, 11694, 14127, 14274, 14484, 14862, 15117, 17049, 19104, 19422, 20577, 25677, 27612, 27714, 28152, 29307, 32232, 34602, 35592
(list; graph; listen)
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OFFSET
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1,1
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MAPLE
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isA123983 := proc(n) RETURN( isprime(8*n+1) and isprime(8*n+5) and isprime(8*n+7) and isprime(8*n+11) ) ; end: for n from 1 to 7000 do if isA123983(n) then printf("%d, ", n) ; fi ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 06 2006
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MATHEMATICA
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Select[Range[37000], And @@ PrimeQ /@ ({1, 5, 7, 11} + 8#) &] (*Chandler*)
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CROSSREFS
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Cf. A005122, A005123, A005124, A005125, A105133.
Sequence in context: A027147 A095724 A139256 this_sequence A071270 A051877 A121693
Adjacent sequences: A123980 A123981 A123982 this_sequence A123984 A123985 A123986
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Oct 30 2006
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EXTENSIONS
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Edited and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net) and R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 05 2006
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