id:A068405 - OEIS Search Results

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Numbers n such that (n+1) is squarefree and composite and such that there is one more distinct prime factor in n than in (n+1).

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84, 90, 105, 110, 114, 132, 140, 154, 165, 182, 186, 204, 220, 234, 246, 252, 258, 264, 266, 273, 286, 290, 294, 300, 308, 318, 322, 340, 345, 354, 357, 364, 370, 380, 385, 402, 406, 410, 414, 426, 444, 450, 465, 468, 470, 480, 492, 504, 516, 518, 525, 532 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`For example 322=2723 has 3 distinct prime factors and 323=17*19 has 2 distinct prime factors, hence 322 is in the sequence.`
	FORMULA	`n such that (1-isprime(n+1))issquarefree(n+1)omega(n)=omega(n+1)+1`
	CROSSREFS	`Sequence in context: A033404 A128873 A095607 this_sequence A045569 A113931 A111313` `Adjacent sequences: A068402 A068403 A068404 this_sequence A068406 A068407 A068408`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 09 2002`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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