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A153487
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Sum of first n perfect numbers A000396, divided by 2.
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0
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3, 17, 265, 4329, 16779497, 4311714025, 73031059689, 1152921577101035753, 1329227995784915873480267885077956841, 95780971304118054976624684827067692545766545852041449
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OFFSET
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1,1
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COMMENTS
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Partial sums of A133028. [From R. J. Mathar, Jan 21 2009]
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LINKS
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Table of n, a(n) for n=1..10.
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FORMULA
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a(n) = A092336(n)/2.
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MATHEMATICA
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Accumulate[(# (#+1))/2&/@Select[2^Range[90]-1, PrimeQ] ]/2 (* Harvey P. Dale, Sep 04 2014 *)
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CROSSREFS
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Cf. A000396, A092336, A153474, A153475, A153476.
Sequence in context: A188803 A084040 A009495 * A267658 A155201 A062622
Adjacent sequences: A153484 A153485 A153486 * A153488 A153489 A153490
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol, Dec 27 2008
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EXTENSIONS
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More terms from R. J. Mathar, Jan 21 2009
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STATUS
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approved
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