A067718 - OEIS

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A067718

Numbers n such that sigma(2^n+1)==0 (mod n).

1, 2, 6, 12, 24, 36, 42, 70, 126, 132, 144, 168, 210, 225, 252 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	PROG	`(PARI) for(n=1, 260, if(sigma(2^n+1)%n==0, print1(n, ", "))) (Brockhaus)`
	CROSSREFS	`Sequence in context: A194096 A099993 A011778 * A028923 A187272 A001116` `Adjacent sequences: A067715 A067716 A067717 * A067719 A067720 A067721`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 05 2002`
	EXTENSIONS	`a(13) to a(15) from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) Apr 13 2005`

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.