id:A121884 - OEIS Search Results

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Excess of n-th semiprime over previous prime.

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1, 1, 2, 3, 1, 2, 2, 3, 2, 3, 2, 3, 4, 1, 2, 3, 2, 4, 2, 4, 5, 1, 4, 2, 1, 4, 3, 2, 3, 4 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = 1 iff n is in A077068. a(n) = 2 iff n is in A062721.`
	FORMULA	`a(n) = Min{A001358(n)-p for p<A001358(n) and p in A000040(k)}.`
	CROSSREFS	`Cf. A000040, A001358, A062721, A077068.` `Sequence in context: A036848 A128864 A106798 this_sequence A079087 A053839 A047896` `Adjacent sequences: A121881 A121882 A121883 this_sequence A121885 A121886 A121887`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost2(AT)yahoo.com), Aug 31 2006`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.