A153487 Sum of first n perfect numbers A000396, divided by 2.

3, 17, 265, 4329, 16779497, 4311714025, 73031059689, 1152921577101035753, 1329227995784915873480267885077956841, 95780971304118054976624684827067692545766545852041449

Offset

1,1

Comments

Partial sums of A133028. [From R. J. Mathar, Jan 21 2009]

Links

Table of n, a(n) for n=1..10.

Formula

a(n) = A092336(n)/2.

Mathematica

Accumulate[(# (#+1))/2&/@Select[2^Range[90]-1, PrimeQ] ]/2 (* Harvey P. Dale, Sep 04 2014 *)

Crossrefs

Cf. A000396, A092336, A153474, A153475, A153476.

Sequence in context: A188803 A084040 A009495 * A267658 A365364 A155201

Adjacent sequences: A153484 A153485 A153486 * A153488 A153489 A153490

Keyword

nonn

Author

Omar E. Pol, Dec 27 2008

Extensions

More terms from R. J. Mathar, Jan 21 2009

Status

approved