id:A074592 - OEIS Search Results

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Smallest prime factors of numbers that are not prime powers.

+0
4

2, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 2, 2, 3, 2, 5, 2, 2, 3, 2, 2, 2, 3, 2, 2, 2, 3, 2, 2, 5, 2, 3, 2, 2, 2, 3, 5, 2, 2, 3, 2, 2, 2, 3, 2, 7, 2, 2, 2, 2, 5, 2, 3, 2, 2, 7, 2, 3, 2, 5, 2, 2, 3, 2, 2, 2, 3, 2, 2, 2, 3, 2, 2, 5, 2, 3, 2, 7, 2, 2, 3, 2, 2, 3, 2, 2, 7, 2, 3, 2, 2, 2, 3, 2, 11, 2, 5, 2, 3, 2, 2, 2, 3, 2 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(n)>2 iff n+1 and n+2 are prime powers (A006549).`
	FORMULA	`a(n) = A020639(A024619(n)).`
	CROSSREFS	`Cf. A074593, A074594, A074595.` `Sequence in context: A136164 A033947 A069719 this_sequence A089993 A047931 A033618` `Adjacent sequences: A074589 A074590 A074591 this_sequence A074593 A074594 A074595`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 25 2002`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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