A066209 A053041(n)-10^(n-1).

0, 0, 2, 0, 0, 2, 6, 0, 8, 0, 10, 8, 12, 4, 5, 0, 16, 8, 18, 0, 5, 12, 22, 8, 0, 16, 8, 8, 28, 20, 30, 0, 32, 24, 10, 8, 36, 28, 17, 0, 40, 2, 42, 12, 35, 36, 46, 32, 41, 0, 2, 40, 52, 8, 10, 32, 14, 48, 58, 20, 60, 52, 26, 0, 10, 56, 66, 20, 38, 50, 70, 8, 72, 64, 50, 64, 10, 74, 78

Offset: 1

Author

Vladeta Jovovic, Dec 17 2001

Keywords

• easy
• nonn

Comments

a(n) = 0 iff n is of form 2^i*5^j (cf. A003592).

Programs

Mathematica

lst = {}; Do[z = n - Mod[10^n/10, n]; If[z == n, z = 0]; AppendTo[lst, z], {n, 79}]; lst (* Arkadiusz Wesolowski, Apr 02 2012 *)