A142863 - OEIS

This site is supported by donations to The OEIS Foundation.

A142863

Semiprimes n (A001358) for which A000001(n) is 2.

4, 6, 9, 10, 14, 21, 22, 25, 26, 34, 38, 39, 46, 49, 55, 57, 58, 62, 74, 82, 86, 93, 94, 106, 111, 118, 121, 122, 129, 134, 142, 146, 155, 158, 166, 169, 178, 183, 194, 201, 202, 203, 205, 206, 214, 218, 219, 226, 237, 253, 254, 262, 274, 278, 289, 291, 298, 301 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Semiprimes p^2 or pq with p<q and gcd(p,q-1)=p. - T. D. Noe, Oct 08 2008`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000` `John H. Conway, Heiko Dietrich and E. A. O'Brien, Counting groups: gnus, moas and other exotica.`
	CROSSREFS	`Sequence in context: A193305 A084759 A054395 * A132435 A108631 A200677` `Adjacent sequences: A142860 A142861 A142862 * A142864 A142865 A142866`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Oct 03 2008`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 04 2008`

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

Last modified February 17 11:46 EST 2012. Contains 206011 sequences.