OFFSET
1,2
LINKS
Jean-Marc Falcoz, Table of n, a(n) for n = 1..2000
EXAMPLE
a(5) = 5 ends with 5, its digital root;
a(6) = 91 ends with 1, its digital root;
a(5) + a(6) = 96 also ends with its digital root.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Jean-Marc Falcoz, May 05 2020
STATUS
approved