A135629 Perfect numbers plus 1.

7, 29, 497, 8129, 33550337, 8589869057, 137438691329, 2305843008139952129, 2658455991569831744654692615953842177, 191561942608236107294793378084303638130997321548169217

Offset: 1

Author

Omar E. Pol, Nov 27 2007

Keywords

• easy
• nonn
• changed

Links

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

Crossrefs

Cf. A000396, A135627.

Programs

Mathematica

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

Formula

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