OFFSET
2,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 2..884 (terms 2..325 from Robert Israel)
FORMULA
a(n) = 3 iff n == 4 or 5 (mod 6). - Robert Israel, Nov 08 2023
MAPLE
f:= n -> min(numtheory:-factorset(n*2^n-1)):
map(f, [$2..100]); # Robert Israel, Nov 08 2023
MATHEMATICA
Table[FactorInteger[n*2^n-1][[1, 1]], {n, 2, 69}] (* Paul F. Marrero Romero, Dec 17 2023 *)
CROSSREFS
KEYWORD
nonn,changed
AUTHOR
Sean A. Irvine, Oct 31 2023
STATUS
approved