id:A062825 - OEIS Search Results

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Ch(A002808(n)) where Ch(n) is Chowla's function and A002808(n) are the composites (including 1).

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-1, 2, 5, 6, 3, 7, 15, 9, 8, 14, 20, 21, 10, 13, 35, 5, 15, 12, 27, 41, 30, 14, 19, 12, 54, 21, 16, 49, 53, 39, 32, 25, 75, 7, 42, 20, 45, 65, 16, 63, 22, 31, 107, 33, 40, 62, 18, 77, 57, 26, 73, 122, 39, 48, 63, 18, 89, 105, 39, 43, 139, 22, 45, 32, 91, 143, 20, 75, 34, 49, 24, 155, 72, 56, 116, 113, 105, 86, 55, 171, 105, 40, 135 (list; graph; listen)

	OFFSET	`1,2`
	PROGRAM	`(PARI) j=[]; for(n=1, 200, if(isprime(n), n+1, j=concat(j, sigma(n)-n-1))); j`
	CROSSREFS	`Cf. A048050 A002808.` `Sequence in context: A134387 A103130 A021800 this_sequence A091655 A021979 A021043` `Adjacent sequences: A062822 A062823 A062824 this_sequence A062826 A062827 A062828`
	KEYWORD	`easy,sign`
	AUTHOR	`Jason Earls (jcearls(AT)cableone.net), Jul 20 2001`

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Last modified July 4 18:25 EDT 2008. Contains 140886 sequences.

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