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Search: id:A069142
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| A069142 |
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Lower prime in a twin pair that yields another. |
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+0
2
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| 5, 29, 659, 809, 2129, 2549, 3329, 3389, 5849, 6269, 10529, 33179, 41609, 44129, 53549, 55439, 57329, 63839, 65099, 70379, 70979, 72269, 74099, 74759, 78779, 80669, 81929, 87539, 93239, 102299, 115469, 124769, 133979, 136949, 156419
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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659 and 661 form a prime twin pair. Their sum is 1320. 1320 is sandwiched between 1319 and 1321, which form another prime twin pair. So 659 is in the sequence.
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MATHEMATICA
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p = q = 1; Do[q = Prime[n]; If[p + 2 == q && PrimeQ[2p + 1] && PrimeQ[2p + 3], Print[p]]; p = q, {n, 1, 10^4}]
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CROSSREFS
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Cf. A014574.
Sequence in context: A087899 A103783 A103515 this_sequence A144994 A072880 A112959
Adjacent sequences: A069139 A069140 A069141 this_sequence A069143 A069144 A069145
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KEYWORD
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nonn
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AUTHOR
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N. Fernandez (primeness(AT)borve.org), Apr 08 2002
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 11 2002
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