id:A126072 - OEIS Search Results

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a(n) = least j>n such that one of p(n)#+p(j)#-1 and p(n)#+p(j)#+1 is prime, or 0 if no such prime exists.

+0
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2, 3, 4, 5, 6, 7, 9, 9, 15, 11, 13, 13, 18, 20, 29, 19, 23, 21, 21, 21, 23, 32, 27, 42, 28, 30, 30, 34, 37, 77, 33, 74, 59, 45, 53, 45, 38, 46, 43, 47, 55, 44, 47, 54, 76, 48, 49, 50, 69, 56, 60, 0, 66, 68, 94, 57, 69, 84, 86, 73, 65, 73, 71, 114, 70, 91, 98, 80, 72, 84, 79, 76 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The first 0 is for n=52. Are there others?`
	EXAMPLE	`2+23-1=7 so a(1)=2` `23+235-1=35 is composite but 23+23*5+1=37 is prime so a(2)=3`
	CROSSREFS	`Sequence in context: A063932 A071191 A097428 this_sequence A082463 A072793 A083047` `Adjacent sequences: A126069 A126070 A126071 this_sequence A126073 A126074 A126075`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), Mar 01 2007`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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