OFFSET
0,2
COMMENTS
If n has an even number of digits in base 9 then a(n) is a multiple of 10.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
FORMULA
a(n) = n + A030108(n).
MATHEMATICA
Table[n+FromDigits[Reverse[IntegerDigits[n, 9]], 9], {n, 0, 70}] (* Harvey P. Dale, Sep 03 2013 *)
PROG
(PARI) a(n) = n + fromdigits(Vecrev(digits(n, 9)), 9); \\ Michel Marcus, Sep 27 2018
CROSSREFS
KEYWORD
AUTHOR
Henry Bottomley, Jul 18 2000
STATUS
approved