id:A124372 - OEIS Search Results

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a(n) = number of earlier terms a(k) such that a(k)*n is of the form m^j, m = integer >= 0, j = integer >= 2.

+0
2

0, 1, 1, 3, 1, 1, 1, 6, 7, 1, 1, 2, 1, 1, 1, 12, 1, 3, 1, 1, 1, 1, 1, 2, 17, 1, 21, 2, 1, 1, 1, 24, 1, 1, 1, 25, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 4, 37, 5, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 2, 53, 1, 1, 1, 2, 1, 1, 1, 10, 1, 1, 4, 1, 1, 1, 1, 2, 63, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 3, 1, 10, 1, 77 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`12a(1) = 0 and 12a(4) = 36 are the two integers of the form m^j (m=nonnegative integer, j = integer >= 2) made by multiplying earlier terms with 12. So a(12) = 2.`
	MATHEMATICA	`f[l_List] := Append[l, Length[Select[(Length[l] + 1)l, # == 0 \|\| GCD @@ Last /@ FactorInteger[ # ] > 1 &]]]; Nest[f, {}, 100] (Chandler*)`
	CROSSREFS	`Cf. A124371.` `Sequence in context: A096744 A080002 A058057 this_sequence A126470 A102480 A140670` `Adjacent sequences: A124369 A124370 A124371 this_sequence A124373 A124374 A124375`
	KEYWORD	`easy,nonn`
	AUTHOR	`Leroy Quet (qq-quet(AT)mindspring.com), Oct 27 2006`
	EXTENSIONS	`Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 29 2006`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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