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A144834
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Numbers n such that the two numbers n+1 and n+3 are both prime.
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2
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2, 4, 10, 16, 28, 40, 58, 70, 100, 106, 136, 148, 178, 190, 196, 226, 238, 268, 280, 310, 346, 418, 430, 460, 520, 568, 598, 616, 640, 658, 808, 820, 826, 856, 880, 1018, 1030, 1048, 1060, 1090, 1150, 1228, 1276, 1288, 1300, 1318, 1426, 1450, 1480, 1486, 1606
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| 1 less than the lesser of each twin prime pair. [From Harvey P. Dale, Nov 08 2011]
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LINKS
| Harvey P. Dale, Table of n, a(n) for n = 1..1000
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FORMULA
| a(n) = A014574(n)-2 = A001359(n)-1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 24 2008
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MATHEMATICA
| Transpose[Select[Partition[Prime[Range[300]], 2, 1], Last[#]-First[#] == 2&]][[1]]-1 (* From Harvey P. Dale, Nov 08 2011 *)
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CROSSREFS
| Cf. A053319 (first differences).
Sequence in context: A111149 A123689 A137928 * A006584 A032246 A141138
Adjacent sequences: A144831 A144832 A144833 * A144835 A144836 A144837
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KEYWORD
| easy,nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Sep 22 2008
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EXTENSIONS
| Definition edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 24 2008
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