id:A108462 - OEIS Search Results

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Number of factorizations of (n,n) into pairs (i,j) with i,j>=1, not both 1.

+0
3

1, 2, 2, 9, 2, 15, 2, 31, 9, 15, 2, 92, 2, 15, 15, 109, 2, 92, 2, 92, 15, 15, 2, 444, 9, 15, 31, 92, 2, 203, 2, 339, 15, 15, 15, 712, 2, 15, 15, 444, 2, 203, 2, 92, 92, 15, 2, 1903, 9, 92, 15, 92, 2, 444, 15, 444, 15, 15, 2, 1663, 2, 15, 92, 1043, 15, 203, 2, 92, 15, 203, 2 (list; graph; listen)

	OFFSET	`1,2`
	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	`Main diagonal of A108461. a(A025487)=A108463. a(p^k)=A002774(k). a(A002110)=A020557.` `Sequence in context: A037290 A155936 A167594 this_sequence A011403 A113554 A085846` `Adjacent sequences: A108459 A108460 A108461 this_sequence A108463 A108464 A108465`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jun 03 2005`

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

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