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Search: id:A055737
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| A055737 |
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Number of prime triples < 10^n, where a prime triple means 3 successive primes of the form {p, p+2, p+4} or {p, p+4, p+6}. |
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+0
2
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| 0, 8, 30, 112, 507, 2837, 17220, 111156, 759256, 5425573, 40174725, 305689269
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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J. Recreational Math., vol. 23, No. 2, 1991, p. 97.
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LINKS
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Index entries for sequences related to numbers of primes in various ranges
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MATHEMATICA
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x=168; a=Table[ Prime[ n ], {n, 1, x} ] c=0; Do[ If[ a[[ n ]]+6==a[ [ n+2 ] ], c++ ], {n, 1, x-2} ]; c # the values of x to use are given by A006880
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CROSSREFS
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Cf. A055738, A006880.
Sequence in context: A107233 A098213 A050477 this_sequence A098741 A027146 A067950
Adjacent sequences: A055734 A055735 A055736 this_sequence A055738 A055739 A055740
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KEYWORD
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more,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 09 2000
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EXTENSIONS
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More terms from Jud McCranie (j.mccranie(AT)comcast.net), Oct 07 2000
More terms from Martin Raab (raab-martin(AT)gmx.de), Oct 04 2006
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