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A069061 Sum of divisors of 2^n+1. 0
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; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=sigma(2^n+1)

CROSSREFS

Sequence in context: A063186 A191198 A191137 * A088811 A007977 A013122

Adjacent sequences:  A069058 A069059 A069060 * A069062 A069063 A069064

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 04 2002

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.