OFFSET
1,1
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..10074
Alois P. Heinz, Positions of first 1410 4's in plane of A274640
FORMULA
A274640(a(n))=4.
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Jul 19 2016
STATUS
approved