id:A069822 - OEIS Search Results

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n such there is at least one x<n such that sigma(x)=sigma(n).

+0
8

11, 15, 17, 23, 25, 26, 31, 35, 38, 39, 41, 46, 47, 51, 53, 55, 56, 58, 59, 62, 65, 69, 70, 71, 75, 77, 78, 79, 82, 83, 87, 89, 92, 94, 95, 97, 103, 107, 110, 113, 115, 116, 118, 119, 122, 123, 124, 125, 127, 130, 131, 135, 139, 140, 141, 142, 143, 145, 151, 153 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI) for(s=1, 200, if(prod(i=1, s-1, sigma(i)-sigma(s))==0, print1(s, ", ")))`
	CROSSREFS	`Sequence in context: A063964 A139065 A111322 this_sequence A116999 A053675 A031944` `Adjacent sequences: A069819 A069820 A069821 this_sequence A069823 A069824 A069825`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 28 2002`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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