id:A071127 - OEIS Search Results

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Number of times there is a prime p < n such that 2n+p is prime.

+0
2

0, 0, 0, 1, 1, 1, 2, 2, 1, 1, 1, 2, 3, 2, 3, 2, 3, 4, 2, 4, 4, 2, 2, 5, 4, 2, 5, 5, 2, 6, 3, 3, 6, 4, 4, 5, 3, 5, 6, 4, 3, 6, 5, 3, 8, 3, 6, 8, 5, 5, 6, 4, 4, 7, 6, 2, 6, 4, 3, 11, 5, 4, 9, 5, 5, 9, 7, 6, 9, 6, 3, 10, 6, 4, 11, 7, 6, 10, 5, 9, 11, 5, 6, 12, 8, 5, 10, 6, 6, 13, 7, 6, 11, 8, 8, 11, 7, 8, 11 (list; graph; listen)

	OFFSET	`1,7`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000`
	EXAMPLE	`a(7)=2 because 14+3 and 14+5 are primes.`
	MATHEMATICA	`For[lst={}; n=1, n<=100, n++, cnt=0; k=1; While[Prime[k]<n, If[PrimeQ[2n+Prime[k]], cnt++ ]; k++ ]; AppendTo[lst, cnt]]; lst`
	CROSSREFS	`Cf. A071137.` `Adjacent sequences: A071124 A071125 A071126 this_sequence A071128 A071129 A071130` `Sequence in context: A105224 A143488 A047070 this_sequence A029381 A027926 A114730`
	KEYWORD	`easy,nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), May 28 2002`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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