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Search: id:A088486
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| A088486 |
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Sequence of primes P=n*(n+1)-1 such that P and P+2 are twin primes. |
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| 5, 11, 29, 41, 71, 239, 419, 461, 599, 1481, 1721, 2549, 2969, 3539, 4421, 8009, 10301, 17291, 19181, 20021, 23561, 24179, 27059, 31151, 35531, 41411, 42641, 43889, 46439, 47741, 53591, 55931, 60761, 83231, 84389, 95789, 98909, 123551, 143261, 156419, 164429
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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20*20 + 20 -1 = 419, 419 and 421 twin primes, 419 is the 7-th of the sequence for n=20.
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CROSSREFS
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a(n) = A088485(n)*(A088485(n)+1)-1. [R. J. Mathar, (mathar(AT)strw.leidenuniv.nl), Nov 14 2009]
Adjacent sequences: A088483 A088484 A088485 this_sequence A088487 A088488 A088489
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KEYWORD
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nonn,new
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AUTHOR
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Pierre CAMI (colettecami(AT)aol.com), Nov 09 2003
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EXTENSIONS
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Sign in definition corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 13 2009
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