id:A078701 - OEIS Search Results

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Least odd prime factor of n, or 1 if no such factor exists.

+0
11

1, 1, 3, 1, 5, 3, 7, 1, 3, 5, 11, 3, 13, 7, 3, 1, 17, 3, 19, 5, 3, 11, 23, 3, 5, 13, 3, 7, 29, 3, 31, 1, 3, 17, 5, 3, 37, 19, 3, 5, 41, 3, 43, 11, 3, 23, 47, 3, 7, 5, 3, 13, 53, 3, 5, 7, 3, 29, 59, 3, 61, 31, 3, 1, 5, 3, 67, 17, 3, 5, 71, 3, 73, 37, 3, 19, 7, 3, 79, 5, 3, 41, 83, 3, 5, 43, 3, 11 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = A020639(A000265(n));` `a(n) = A020639(n) iff n is odd; a(2^k) = 1.` `A000265, A020639, A005408, A000079.`
	CROSSREFS	`Sequence in context: A099550 A099549 A082725 this_sequence A161398 A161820 A116528` `Adjacent sequences: A078698 A078699 A078700 this_sequence A078702 A078703 A078704`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 18 2002`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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