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A143727
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Near-prime numbers: numbers n such that n-2=prime, n+2=prime, n-4=prime, n+4=prime, n-8=prime, n+8=prime.
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0
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15, 105, 16065, 19425, 43785, 1091265, 1615845, 1954365, 2822715, 2839935, 3243345, 3400215, 6005895, 6503595, 7187775, 7641375, 8062005, 8741145, 10526565, 11086845, 11664555, 14520555, 14812875, 14834715, 14856765
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| a(n)=8+A022008(n). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 31 2008]
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EXAMPLE
| 15-2=13,15+2=17,15-4=11,15+4=19,15-8=7,15+8=23.
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MATHEMATICA
| lst={}; Do[If[PrimeQ[n-2]&&PrimeQ[n+2]&&PrimeQ[n-4]&&PrimeQ[n+4]&&PrimeQ[n-8]&&PrimeQ[n+8], AppendTo[lst, n]], {n, 5*10!}]; lst
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CROSSREFS
| Sequence in context: A165892 A077261 A012507 * A041426 A074877 A202255
Adjacent sequences: A143724 A143725 A143726 * A143728 A143729 A143730
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KEYWORD
| nonn
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AUTHOR
| Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 30 2008
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