OFFSET
1,1
LINKS
Heiko Harborth, On h-perfect numbers, Annales Mathematicae et Informaticae, 41 (2013) pp. 57-62.
FORMULA
a(n) = 5*2^A001770(n) - 1. - Max Alekseyev, Feb 20 2024
MATHEMATICA
Select[Table[5*2^n-1, {n, 0, 150}], PrimeQ] (* Jean-François Alcover, Mar 21 2011 *)
CROSSREFS
KEYWORD
nonn,nice
AUTHOR
N. J. A. Sloane, Dec 29 1999
STATUS
approved