id:A108466 - OEIS Search Results

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Number of factorizations of (n,n) into pairs (i,j) with i,j>1.

+0
3

1, 1, 1, 2, 1, 3, 1, 4, 2, 3, 1, 11, 1, 3, 3, 9, 1, 11, 1, 11, 3, 3, 1, 35, 2, 3, 4, 11, 1, 25, 1, 20, 3, 3, 3, 55, 1, 3, 3, 35, 1, 25, 1, 11, 11, 3, 1, 106, 2, 11, 3, 11, 1, 35, 3, 35, 3, 3, 1, 132, 1, 3, 11, 45, 3, 25, 1, 11, 3, 25, 1, 222, 1, 3, 11, 11, 3, 25, 1, 106, 9, 3, 1, 132, 3, 3 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`(a,b)(x,y)=(ax,by).` `a(n) depends only on prime signature of n (cf. A025487). So a(24) = a(375) since 24=2^33 and 375=3*5^3 both have prime signature (3,1).`
	CROSSREFS	`Cf. A108461. Main diagonal of A108465. a(A025487)=A108467. a(p^k)=A108469(k). a(A002110)=A023997.` `Sequence in context: A118314 A002033 A074206 this_sequence A087145 A117172 A029207` `Adjacent sequences: A108463 A108464 A108465 this_sequence A108467 A108468 A108469`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jun 03 2005`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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