A107744 - OEIS

This site is supported by donations to The OEIS Foundation.

A107744

Smallest prime factor of 6*n+1.

7, 13, 19, 5, 31, 37, 43, 7, 5, 61, 67, 73, 79, 5, 7, 97, 103, 109, 5, 11, 127, 7, 139, 5, 151, 157, 163, 13, 5, 181, 11, 193, 199, 5, 211, 7, 223, 229, 5, 241, 13, 11, 7, 5, 271, 277, 283, 17, 5, 7, 307, 313, 11, 5, 331, 337, 7, 349, 5, 19, 367, 373, 379, 5, 17, 397, 13, 409 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`If 6n+1 is prime, a(n) = 6n+1. Cf. A107745 Smallest prime factor of 6*n-1, A107746 Values of n such that A107745(n)>A107746(n), A107747 Values of n such that A107745(n) < A107746(n).`
	MATHEMATICA	`A107744[n_]:= FactorInteger[6 n + 1][[1, 1]]`
	CROSSREFS	`Cf. A107745, A107746, A107747.` `Sequence in context: A005762 A168465 A104995 * A173928 A160007 A024613` `Adjacent sequences: A107741 A107742 A107743 * A107745 A107746 A107747`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), May 23 2005`

Content is available under The OEIS End-User License Agreement .

Last modified February 17 13:18 EST 2012. Contains 206031 sequences.