OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..69
FORMULA
a(n) = Product_{d|2^n + 1} d. - Wesley Ivan Hurt, Jan 23 2017
MATHEMATICA
Times@@Divisors[#]&/@(2^Range[20]+1) (* Harvey P. Dale, Mar 05 2020 *)
PROG
(PARI) a(n) = my(d=divisors(2^n+1)); prod(k=1, #d, d[k]); \\ Michel Marcus, Jan 24 2017
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Apr 04 2002
STATUS
approved