id:A162730 - OEIS Search Results

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Semiprimes of the form n=pq where q=kp-k+1, p,q primes and k > 1

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6, 10, 14, 15, 21, 22, 26, 33, 34, 38, 39, 46, 51, 57, 58, 62, 65, 69, 74, 82, 85, 86, 87, 91, 93, 94, 106, 111, 118, 122, 123, 129, 133, 134, 141, 142, 145, 146, 158, 159, 166, 177, 178, 183, 185, 194, 201, 202, 205, 206, 213, 214, 217, 218, 219, 226, 237, 249, 254 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`It seems that most of the semiprimes of this form (but not all, only those satisfying an aditional property) can be factored very quickly (e.g. numbers with up to 1200 decimal digits can be factored in a couple of seconds) using a very simple method`
	CROSSREFS	`Sequence in context: A052053 A006881 A030229 this_sequence A093772 A046400 A100660` `Adjacent sequences: A162727 A162728 A162729 this_sequence A162731 A162732 A162733`
	KEYWORD	`nonn`
	AUTHOR	`Vassilis Papadimitriou (bpapa(AT)sch.gr), Jul 12 2009, Jul 13 2009`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 06 2009`

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

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