id:A115393 - OEIS Search Results

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Numbers n such that n, n-1 and n-2 are semiprimes.

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35, 87, 95, 123, 143, 203, 215, 219, 303, 395, 447, 635, 699, 843, 923, 1043, 1139, 1263, 1347, 1403, 1643, 1763, 1839, 1895, 1943, 1983, 2103, 2183, 2219, 2307, 2363, 2435, 2463, 2519, 2643, 2723, 2735, 3099, 3387, 3603, 3695, 3867, 3903, 3959, 4287 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=A056809(n)+2=A086005(n)+1=2*A086006(n)+1.`
	CROSSREFS	`Cf. A056809, A086005, A086006.` `Sequence in context: A044173 A044554 A119691 this_sequence A086337 A118631 A020295` `Adjacent sequences: A115390 A115391 A115392 this_sequence A115394 A115395 A115396`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Mar 08 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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