OFFSET
0,3
LINKS
Rémy Sigrist, Table of n, a(n) for n = 0..25000
Rémy Sigrist, C++ program for A064291
PROG
(C++) See Links section.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 25 2001
EXTENSIONS
a(0)=0 added by N. J. A. Sloane, May 01 2020
STATUS
approved