id:A081309 - OEIS Search Results

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Smallest prime p such that n-p is an 3-smooth number, a(n)=0 if no such prime exists.

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0, 0, 2, 2, 2, 2, 3, 2, 3, 2, 2, 3, 5, 2, 3, 7, 5, 2, 3, 2, 3, 13, 5, 23, 7, 2, 3, 19, 2, 3, 7, 5, 17, 2, 3, 0, 5, 2, 3, 13, 5, 41, 7, 17, 13, 19, 11, 47, 13, 2, 3, 43, 5, 53, 7, 2, 3, 31, 5, 59, 7, 53, 31, 37, 11, 2, 3, 41, 5, 43, 7, 71, 19, 2, 3, 67, 5, 0, 7, 53, 17, 73, 2, 3, 13, 5, 23, 7, 17, 89 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n)=0 iff A081308(n)=0.`
	EXAMPLE	`a(25)=7: 25=7+2*3^2.`
	CROSSREFS	`Cf. A081310, A081311, A081309, A000040, A003586.` `Sequence in context: A128764 A074589 A165035 this_sequence A010553 A163374 A108502` `Adjacent sequences: A081306 A081307 A081308 this_sequence A081310 A081311 A081312`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 17 2003`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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