id:A076396 - OEIS Search Results

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Smallest prime factor of n-th perfect power.

+0
4

1, 2, 2, 3, 2, 5, 3, 2, 2, 7, 2, 3, 2, 11, 5, 2, 2, 13, 2, 2, 3, 3, 2, 17, 2, 7, 19, 2, 3, 2, 2, 23, 2, 5, 2, 3, 2, 29, 2, 31, 2, 2, 3, 2, 5, 2, 11, 37, 2, 3, 2, 41, 2, 2, 43, 2, 3, 2, 2, 3, 13, 47, 2, 7, 2, 3, 2, 2, 53, 2, 5, 5, 2, 3, 2, 3, 59, 2, 61, 2, 3, 2, 5, 2, 67, 2, 3, 2, 17, 71, 2, 73, 2, 3 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = A020639(A025478(n)).`
	LINKS	`Eric Weisstein's World of Mathematics, Perfect Powers.` `Eric Weisstein's World of Mathematics, Least Prime Factor.`
	FORMULA	`A020639(A001597(n)).`
	CROSSREFS	`Cf. A025478, A076397, A076403.` `Sequence in context: A115119 A066656 A118136 this_sequence A076397 A076403 A025478` `Adjacent sequences: A076393 A076394 A076395 this_sequence A076397 A076398 A076399`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Oct 09 2002`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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