id:A121089 - OEIS Search Results

Search: id:A121089

Displaying 1-1 of 1 results found.

page 1

Numbers n such that f(n), f(n+1) and f(n+2) are prime, f(m)=72*m^2+7.

+0
1

9, 24, 169, 1479, 2964, 3039, 3299, 4084, 4474, 5534, 5574, 6449, 7359, 7409, 7529, 10789, 10879, 10994, 13819, 14324, 18574, 19709, 20329, 20749, 22179, 24529, 25089, 25104, 25229, 25404, 27714, 27779, 29849, 30234, 32369, 33384, 34799 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Apparently there are no four subsequent numbers m with f(m) prime.`
	MATHEMATICA	`Reap[Do[If[PrimeQ[72n^2+7]&&PrimeQ[72(n+1)^2+7]&&PrimeQ[72*(n+2)^2+7], Sow[n]], {n, 0, 300000}]][[2, 1]]`
	CROSSREFS	`Cf. A007522, A121068.` `Sequence in context: A079770 A079771 A038626 this_sequence A050282 A096757 A101158` `Adjacent sequences: A121086 A121087 A121088 this_sequence A121090 A121091 A121092`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Aug 11 2006`

page 1

Search completed in 0.002 seconds

Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

AT&T Labs Research