OFFSET
1,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..19682
EXAMPLE
a(21)=14 since 21 and 20 are written in base 3 as 210 and 202 and so their tersum is 112 in base 3, i.e. 9+3+2=14.
CROSSREFS
KEYWORD
nonn,look
AUTHOR
Henry Bottomley, Jan 22 2001
STATUS
approved