id:A069061 - OEIS Search Results

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Sum of divisors of 2^n+1.

+0
1

4, 6, 13, 18, 48, 84, 176, 258, 800, 1302, 2736, 4356, 10928, 20520, 51792, 65538, 174768, 351120, 699056, 1110276, 3100240, 5048232, 11184816, 17041416, 49012992, 82623888, 211053040, 284225796, 727960800, 1494039792, 2863311536 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=sigma(2^n+1)`
	CROSSREFS	`Sequence in context: A137821 A010061 A063186 this_sequence A088811 A007977 A013122` `Adjacent sequences: A069058 A069059 A069060 this_sequence A069062 A069063 A069064`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 04 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research