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A135629 Perfect numbers plus 1. 1
7, 29, 497, 8129, 33550337, 8589869057, 137438691329, 2305843008139952129, 2658455991569831744654692615953842177, 191561942608236107294793378084303638130997321548169217 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..15

FORMULA

a(n) = A000396(n) + 1.

MATHEMATICA

(# (# + 1))/2 & /@ Select[2^Range[100] - 1, PrimeQ] + 1 (* G. C. Greubel, Oct 24 2016, based on Harvey P. Dale code from A000396 *)

CROSSREFS

Cf. A000396, A135627.

Sequence in context: A071918 A183434 A120789 * A122119 A300528 A157422

Adjacent sequences:  A135626 A135627 A135628 * A135630 A135631 A135632

KEYWORD

easy,nonn

AUTHOR

Omar E. Pol, Nov 27 2007

STATUS

approved

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Last modified October 18 15:21 EDT 2019. Contains 328162 sequences. (Running on oeis4.)