A166140 - OEIS

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A166140

Product of the non-zero elements of the n-th row of A166139.

1, 2, 3, 2, 5, 6, 7, 2, 3, 10, 11, 6, 13, 14, 15, 2, 17, 6, 19, 10, 21, 22, 23, 6, 5, 26, 3, 14, 29, 900, 31, 2, 33, 34, 35, 6, 37, 38, 39, 10, 41, 1764, 43, 22, 15, 46, 47, 6, 7, 10, 51, 26, 53, 6, 55, 14, 57, 58, 59, 900, 61, 62, 21, 2, 65, 4356, 67, 34, 69, 4900, 71, 6, 73, 74, 15 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Differs from A007947 at n = 30.`
	MAPLE	`A080305 := proc(n) if numtheory[mobius](n) < 0 then n; else 1; end if; end proc:` `A126988 := proc(n, k) if n mod k = 0 then n/k ; else 0; end if; end proc:` `A166139 := proc(n, k) A080305(A126988(n, k)) ; end proc:` `A166140 := proc(n) a := 1 ; for k from 1 to n do if n mod k = 0 then a := a* A166139(n, k) ; end if; end do: a ; end proc:` `seq(A166140(n), n=1..75) ; # R. J. Mathar, May 30 2011`
	CROSSREFS	`Cf. A166139, A014963.` `Sequence in context: A062953 A015052 A053166 * A019555 A052410 A175781` `Adjacent sequences: A166137 A166138 A166139 * A166141 A166142 A166143`
	KEYWORD	`nonn`
	AUTHOR	`Mats Granvik (mats.granvik(AT)abo.fi), Oct 08 2009`

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Last modified February 15 12:25 EST 2012. Contains 205786 sequences.