id:A062973 - OEIS Search Results

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Chowla function of n is not divisible by phi(n).

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6, 8, 9, 10, 12, 14, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Chowla's function (A048050) = sum of divisors of n except 1 and n.`
	PROGRAM	`(PARI) j=[]; for(n=1, 400, if(Mod(sigma(n)-n-1, eulerphi(n))!=0, j=concat(j, n))); j`
	CROSSREFS	`Sequence in context: A043373 A054047 A056653 this_sequence A070162 A030550 A024321` `Adjacent sequences: A062970 A062971 A062972 this_sequence A062974 A062975 A062976`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 24 2001`

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Last modified August 28 19:25 EDT 2008. Contains 143183 sequences.

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