id:A062972 - OEIS Search Results

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Chowla function of n is divisible by phi(n).

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1, 2, 3, 4, 5, 7, 11, 13, 15, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Chowla's function (A048050) = sum of divisors of n except 1 and n.`
	PROGRAM	`(PARI) j=[]; for(n=1, 600, if(Mod(sigma(n)-n-1, eulerphi(n)) == 0, j=concat(j, n))); j`
	CROSSREFS	`Sequence in context: A001087 A055464 A139316 this_sequence A036844 A033070 A046022` `Adjacent sequences: A062969 A062970 A062971 this_sequence A062973 A062974 A062975`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 24 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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