id:A099910 - OEIS Search Results

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Number of distinct prime-factors of ((prime(n)*(prime(n+1)-1)+(prime(n)-1)*prime(n+1))/2).

+0
2

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

	OFFSET	`2,3`
	COMMENT	`a(n) = A001221(A099909(n)).`
	CROSSREFS	`Cf. A099911.` `Sequence in context: A164995 A055718 A007302 this_sequence A043555 A118821 A118824` `Adjacent sequences: A099907 A099908 A099909 this_sequence A099911 A099912 A099913`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 29 2004`

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

AT&T Labs Research