id:A071538 - OEIS Search Results

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Number of twin prime pairs <= n.

+0
13

0, 0, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 (list; graph; listen)

	OFFSET	`1,5`
	COMMENT	`The convention is followed that a twin prime is <= n if its smaller member is <= n.`
	REFERENCES	`S. Lang, The Beauty of Doing Mathematics, pp. 12-15; 21-22, Springer-Verlag NY 1985.`
	LINKS	`Thomas R. Nicely, Some Results of Computational Research in Prime Numbers.` `Eric Weisstein's World of Mathematics, Twin Primes.`
	EXAMPLE	`a(30)=5, since (29,31) is included along with (3,5), (5,7), (11,13) and (17,19).`
	CROSSREFS	`Cf. A007508, A033843, A001359, A006512.` `Sequence in context: A067099 A098429 A132090 this_sequence A138194 A133876 A097992` `Adjacent sequences: A071535 A071536 A071537 this_sequence A071539 A071540 A071541`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), May 30 2002`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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