id:A062822 - OEIS Search Results

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Sum of divisors of the square-free numbers: sigma(A005117(n)).

+0
3

1, 3, 4, 6, 12, 8, 18, 12, 14, 24, 24, 18, 20, 32, 36, 24, 42, 30, 72, 32, 48, 54, 48, 38, 60, 56, 42, 96, 44, 72, 48, 72, 54, 72, 80, 90, 60, 62, 96, 84, 144, 68, 96, 144, 72, 74, 114, 96, 168, 80, 126, 84, 108, 132, 120, 90, 112, 128, 144, 120, 98, 102, 216, 104, 192 (list; graph; listen)

	OFFSET	`1,2`
	PROGRAM	`(PARI) j=[]; for(n=1, 200, if(issquarefree(n), j=concat(j, sigma(n)))); j`
	CROSSREFS	`Adjacent sequences: A062819 A062820 A062821 this_sequence A062823 A062824 A062825` `Sequence in context: A022935 A048229 A002090 this_sequence A113728 A000114 A136243`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 20 2001`

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Last modified November 8 20:39 EST 2009. Contains 166234 sequences.

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