id:A072864 - OEIS Search Results

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Numbers n such that the smallest k dividing sigma(k*n^2) is equal to 3.

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7, 13, 14, 19, 21, 26, 28, 31, 35, 37, 38, 39, 42, 43, 52, 56, 57, 61, 62, 63, 65, 67, 70, 73, 74, 76, 77, 78, 79, 84, 86, 91, 93, 95, 97, 103, 104, 105, 109, 111, 112, 114, 117, 119, 122, 124, 126, 127, 129, 130, 133, 134, 139, 140, 143, 146, 148, 151, 152, 154 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Sequence contains primes of the form 6x+1 (A002476) and multiples of those primes, except (6x+1)^2. If x is not in the sequence, the smallest k dividing sigma(k*x^2) is equal to 6.`
	CROSSREFS	`Sequence in context: A057930 A013651 A050931 this_sequence A120100 A104217 A135054` `Adjacent sequences: A072861 A072862 A072863 this_sequence A072865 A072866 A072867`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jul 27 2002`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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