id:A031218 - OEIS Search Results

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Largest prime power <= n.

+0
6

1, 2, 3, 4, 5, 5, 7, 8, 9, 9, 11, 11, 13, 13, 13, 16, 17, 17, 19, 19, 19, 19, 23, 23, 25, 25, 27, 27, 29, 29, 31, 32, 32, 32, 32, 32, 37, 37, 37, 37, 41, 41, 43, 43, 43, 43, 47, 47, 49, 49, 49, 49, 53, 53, 53, 53, 53, 53, 59, 59, 61, 61, 61, 64, 64, 64, 67, 67, 67, 67, 71, 71 (list; graph; listen)

	OFFSET	`1,2`
	PROGRAM	`(PARI) a(n)=if(n<1, 0, while(matsize(factor(n))[1]>1, n--); n)`
	CROSSREFS	`Cf. A000015.` `Sequence in context: A073137 A131233 A136623 this_sequence A163382 A094017 A092762` `Adjacent sequences: A031215 A031216 A031217 this_sequence A031219 A031220 A031221`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`More terms from Erich Friedman (erich.friedman(AT)stetson.edu).`

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

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