id:A085722 - OEIS Search Results

Search: id:A085722

Displaying 1-1 of 1 results found.

page 1

Numbers n such that n^2 + 1 is a semiprime.

+0
2

3, 5, 8, 9, 11, 12, 15, 19, 22, 25, 28, 29, 30, 34, 35, 39, 42, 44, 45, 46, 48, 49, 50, 51, 52, 58, 59, 60, 61, 62, 64, 65, 69, 71, 76, 78, 79, 80, 85, 86, 88, 92, 95, 96, 100, 101, 102, 104, 106, 108, 114, 121, 131, 136, 139, 140, 141, 144, 145, 152, 154, 158, 159, 164 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	MATHEMATICA	`lst={}; Do[If[Plus@@Last/@FactorInteger[n^2+1]==2, AppendTo[lst, n]], {n, 0, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Mar 24 2009]`
	CROSSREFS	`Sequence in context: A064186 A134427 A065347 this_sequence A023980 A047624 A108594` `Adjacent sequences: A085719 A085720 A085721 this_sequence A085723 A085724 A085725`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 20 2003`

page 1

Search completed in 0.002 seconds

Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

AT&T Labs Research