id:A131368 - OEIS Search Results

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Co-prime semiprimes: a(n-1) and a(n) are the closest co-prime semiprimes.

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4, 9, 10, 21, 22, 25, 26, 33, 34, 35, 38, 39, 46, 49, 51, 55, 57, 58, 65, 69, 74, 77, 82, 85, 86, 87, 91, 93, 94, 95, 106, 111, 115, 118, 119, 121, 122, 123, 133, 134, 141, 142, 143, 145, 146, 155, 158, 159, 161, 166, 169, 177, 178, 183, 185, 187, 194, 201, 202, 203 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The slowest increasing sequence of semiprimes with co-prime neighbor terms. Cf. A051884, A061766, A107621, A109412.`
	FORMULA	`gcd(a(n-1),a(n))=1.`
	CROSSREFS	`Cf. A051884, A061766, A107621, A109412.` `Sequence in context: A004631 A119718 A051884 this_sequence A131457 A072525 A107621` `Adjacent sequences: A131365 A131366 A131367 this_sequence A131369 A131370 A131371`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Sep 30 2007`

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

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