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A153476 Sum of first n even superperfect numbers A061652, divided by 2. 2
1, 3, 11, 43, 2091, 34859, 165931, 537036843, 576460752840460331, 154742505487133287202850859, 40564973949808827981181705422891, 42535336430091257741749807110676449323 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

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

FORMULA

a(n) = A153475(n)/2 [From Max Alekseyev (maxale(AT)gmail.com), Jul 27 2009]

CROSSREFS

Cf. A153474, A153475.

Sequence in context: A126614 A000979 A123628 * A107290 A122393 A012880

Adjacent sequences:  A153473 A153474 A153475 * A153477 A153478 A153479

KEYWORD

nonn

AUTHOR

Omar E. Pol (info(AT)polprimos.com), Dec 27 2008

EXTENSIONS

More terms from Max Alekseyev (maxale(AT)gmail.com), Jul 27 2009

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Last modified February 14 13:08 EST 2012. Contains 205623 sequences.