OFFSET
1,2
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..5000 (first 266 terms from Lars Blomberg)
Rémy Sigrist, PARI program for A307631
Rémy Sigrist, C++ program for A307631
PROG
(PARI) See Links section.
(C++) See Links section.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 25 2019
EXTENSIONS
More terms from Rémy Sigrist, Apr 25 2019
STATUS
approved