login
A135629
Perfect numbers plus 1.
1
7, 29, 497, 8129, 33550337, 8589869057, 137438691329, 2305843008139952129, 2658455991569831744654692615953842177, 191561942608236107294793378084303638130997321548169217
OFFSET
1,1
LINKS
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
Sequence in context: A375355 A183434 A120789 * A122119 A300528 A243623
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, Nov 27 2007
STATUS
approved