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Sum of first n even superperfect numbers A061652, divided by 2.
2

%I #4 Mar 30 2012 17:33:58

%S 1,3,11,43,2091,34859,165931,537036843,576460752840460331,

%T 154742505487133287202850859,40564973949808827981181705422891,

%U 42535336430091257741749807110676449323

%N Sum of first n even superperfect numbers A061652, divided by 2.

%C Also, sum of first n superperfect numbers A019279, divided by 2, if there are no odd superperfect numbers.

%F a(n) = A153475(n)/2 [From _Max Alekseyev_, Jul 27 2009]

%Y Cf. A153474, A153475.

%K nonn

%O 1,2

%A _Omar E. Pol_, Dec 27 2008

%E More terms from _Max Alekseyev_, Jul 27 2009