id:A070242 - OEIS Search Results

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Card( k>0 : sigma(k)=sigma(n) ).

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1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 2, 1, 1, 3, 3, 2, 2, 1, 1, 3, 2, 1, 3, 3, 2, 3, 1, 2, 1, 5, 2, 1, 3, 2, 3, 1, 1, 3, 2, 3, 3, 4, 1, 3, 1, 5, 3, 2, 1, 1, 5, 2, 2, 4, 5, 4, 2, 3, 3, 6, 1, 4, 2, 1, 3, 5, 1, 2, 4, 5, 5, 1, 1, 2, 2, 2, 4, 6, 2, 2, 1, 2, 3, 3, 2, 2, 4, 4, 3, 3, 1, 6, 2, 5, 4, 6, 2, 1, 2, 1, 1, 5, 2, 2, 5 (list; graph; listen)

	OFFSET	`1,6`
	PROGRAM	`(PARI) for(n=1, 150, print1(sum(i=1, 10*n, if(sigma(n)-sigma(i), 0, 1)), ", "))`
	CROSSREFS	`Sequence in context: A025890 A043277 A025864 this_sequence A037226 A089641 A086995` `Adjacent sequences: A070239 A070240 A070241 this_sequence A070243 A070244 A070245`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), May 09 2002`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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