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Search: id:A049481
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| A049481 |
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Both p and p+30 are primes (Q(3) is the 3rd primorial number, see A002110). |
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+0
3
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| 7, 11, 13, 17, 23, 29, 31, 37, 41, 43, 53, 59, 67, 71, 73, 79, 83, 97, 101, 107, 109, 127, 137, 149, 151, 163, 167, 181, 193, 197, 199, 211, 227, 233, 239, 241, 251, 263, 277, 281, 283, 307, 317, 337, 349, 353, 359, 367, 379, 389, 401, 409, 419, 431, 433, 449
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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p and p+30 are not necessarily consecutive primes. Initial segment of A045320 is identical, but 113 is not in this sequence because 113+30=143 is divisible by 13.
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EXAMPLE
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7 and 7 + 2*3*5 = 37 is prime
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MATHEMATICA
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lst={}; Do[p=Prime[n]; If[PrimeQ[p+30], AppendTo[lst, p]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 04 2009]
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CROSSREFS
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A045320, A001359, A023201.
Cf. A049482, A049485, A049481, A154114 [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 04 2009]
Sequence in context: A110583 A103486 A086843 this_sequence A067557 A103485 A073704
Adjacent sequences: A049478 A049479 A049480 this_sequence A049482 A049483 A049484
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu)
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