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Search: id:A023230
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| A023230 |
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Numbers n such that n and 8n + 5 both prime. |
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+0
4
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| 3, 7, 13, 19, 43, 67, 103, 109, 127, 139, 151, 181, 193, 199, 211, 223, 241, 277, 283, 349, 379, 397, 421, 433, 439, 463, 577, 601, 607, 613, 619, 727, 733, 787, 829, 853, 883, 967, 991, 1033, 1039, 1117, 1201, 1237, 1291, 1303, 1399, 1429, 1459, 1531, 1567, 1579
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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lst={}; Do[p=Prime[n]; If[PrimeQ[8*p+5], AppendTo[lst, p]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 16 2009]
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PROGRAM
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(MAGMA) [ p: p in PrimesUpTo(1580) | IsPrime(8*p+5) ]; [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 21 2008]
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CROSSREFS
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Cf. A007521 (primes of form 8n+5), A105133 (numbers n such that 8n+5 is prime). [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 21 2008]
Sequence in context: A046136 A098044 A134765 this_sequence A106080 A014283 A033551
Adjacent sequences: A023227 A023228 A023229 this_sequence A023231 A023232 A023233
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net)
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