OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, PerfectNumber
EXAMPLE
For n = 1, a(1) = 30 since sqrt(30 + sqrt(30 + sqrt(30 + ...))) = 6, which is an even perfect number.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Aug 07 2015
STATUS
approved