id:A105455 - OEIS Search Results

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Numbers n such that n*prime(n)+(n+1)*prime(n+1)+(n+2)*prime(n+2) is prime.

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5

1, 6, 12, 20, 22, 24, 28, 30, 34, 56, 60, 142, 144, 148, 168, 192, 196, 230, 252, 260, 276, 282, 304, 322, 334, 344, 346, 352, 366, 374, 380, 386, 394 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`bb={}; Do[If[PrimeQ[n Prime[n]+(n+1) Prime[n+1]+(n+2) Prime[n+2]], bb=Append[bb, n]], {n, 1, 400}]; bb`
	CROSSREFS	`Sequence in context: A146923 A087883 A162416 this_sequence A083207 A145278 A094371` `Adjacent sequences: A105452 A105453 A105454 this_sequence A105456 A105457 A105458`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), May 02 2005`

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

AT&T Labs Research