id:A097706 - OEIS Search Results

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Part of n composed of prime factors of form 4k+3.

+0
4

1, 1, 3, 1, 1, 3, 7, 1, 9, 1, 11, 3, 1, 7, 3, 1, 1, 9, 19, 1, 21, 11, 23, 3, 1, 1, 27, 7, 1, 3, 31, 1, 33, 1, 7, 9, 1, 19, 3, 1, 1, 21, 43, 11, 9, 23, 47, 3, 49, 1, 3, 1, 1, 27, 11, 7, 57, 1, 59, 3, 1, 31, 63, 1, 1, 33, 67, 1, 69, 7, 71, 9, 1, 1, 3, 19, 77, 3, 79, 1, 81, 1, 83, 21 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(A004614(n)) = A004614(n), a(A072437(n)) = 1.`
	PROGRAM	`(PARI) a(n)=local(f):f=factor(n):prod(k=1, matsize(f)[1], if(f[k, 1]%4<>3, 1, f[k, 1]^f[k, 2]))`
	CROSSREFS	`Equals n / A072436(n).` `Sequence in context: A107294 A161788 A140211 this_sequence A132740 A106621 A011085` `Adjacent sequences: A097703 A097704 A097705 this_sequence A097707 A097708 A097709`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, Aug 30 2004`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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