id:A071182 - OEIS Search Results

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SPF(n+1)-SPF(n), where SPF(n) denotes the smallest prime factor of n.

+0
1

1, -1, 3, -3, 5, -5, 1, -1, 9, -9, 11, -11, 1, -1, 15, -15, 17, -17, 1, -1, 21, -21, 3, -3, 1, -1, 27, -27, 29, -29, 1, -1, 3, -3, 35, -35, 1, -1, 39, -39, 41, -41, 1, -1, 45, -45, 5, -5, 1, -1, 51, -51, 3, -3, 1, -1, 57, -57, 59, -59, 1, -1, 3, -3, 65, -65, 1, -1, 69, -69, 71, -71, 1, -1, 5, -5, 77, -77, 1, -1, 81, -81, 3, -3, 1 (list; graph; listen)

	OFFSET	`2,3`
	MATHEMATICA	`g[n_] := (FactorInteger[n])[[1]][[1]]; f[n_] := g[n + 1] - g[n]; Table[f[i], {i, 2, 100}]`
	CROSSREFS	`Sequence in context: A087852 A087853 A095334 this_sequence A136027 A133772 A129972` `Adjacent sequences: A071179 A071180 A071181 this_sequence A071183 A071184 A071185`
	KEYWORD	`sign`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jun 10 2002`

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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.

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