A069912 a(n) = A067552(n)/9 where A067552(n) = SumOfDigits(n)^2 - SumOfDigits(n^2), with SumOfDigits = A007953.

0, 0, 0, 0, 1, 2, 3, 4, 6, 8, 0, 0, 0, 0, 1, 3, 4, 5, 8, 10, 0, 0, 0, 1, 2, 4, 5, 7, 9, 12, 0, 0, 2, 2, 4, 6, 7, 9, 12, 15, 1, 1, 2, 3, 5, 8, 10, 12, 15, 18, 2, 3, 4, 5, 7, 10, 12, 14, 17, 20, 3, 4, 5, 6, 9, 12, 14, 16, 20, 23, 4, 6, 7, 9, 11, 14, 16, 19, 23, 27, 6, 7, 9, 10, 14, 17, 19, 22, 26, 30

Offset: 0

Author

Vladeta Jovovic, May 04 2002

Keywords

• nonn
• base

Links

• Ivan Neretin, Table of n, a(n) for n = 0..10000

Programs

PARI

a(n) = (sumdigits(n)^2 - sumdigits(n^2))/9; \\ Michel Marcus, Sep 01 2016

Extensions

Offset changed to 0 for compatibility with A067552 by Ivan Neretin, Sep 01 2016