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Search: id:A123992
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| A123992 |
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Numbers n for which 16n+1, 16n+3 and 16n+13 are primes. |
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1
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| 1, 40, 106, 133, 250, 265, 271, 280, 295, 313, 418, 580, 691, 736, 748, 826, 946, 1231, 1240, 1435, 1471, 1561, 1756, 2023, 2035, 2038, 2101, 2575, 2728, 2878, 2926, 3268, 3400, 3451, 3688, 3715, 3883, 4213, 4306, 4726, 4936, 5080, 5398, 5761, 5908, 6046
(list; graph; listen)
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OFFSET
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1,2
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MAPLE
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a:=proc(n) if isprime(16*n+1)=true and isprime(16*n+3)=true and isprime(16*n+13)=true then n else fi end: seq(a(n), n=1..5000); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 03 2006
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MATHEMATICA
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Select[Range[6100], And @@ PrimeQ /@ ({1, 3, 13} + 16#) &] (*Chandler*)
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CROSSREFS
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Cf. A092022.
Sequence in context: A043999 A044227 A044608 this_sequence A043470 A044291 A044672
Adjacent sequences: A123989 A123990 A123991 this_sequence A123993 A123994 A123995
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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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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 05 2006
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