A259082 a(n) = largest k such that the decimal representation of 5^k does not contain the digit n, or -1 if every power of 5 contains the digit n.

58, 42, 1, 23, 55, -1, 45, 53, 24, 65

Offset

0,1

Comments

These values are only conjectural.

Links

Table of n, a(n) for n=0..9.

Popular Computing (Calabasas, CA), Two Tables, Vol. 1, (No. 9, Dec 1973), page PC9-16.

Crossrefs

Sequence in context: A225434 A225415 A033378 * A366457 A105326 A247096

Adjacent sequences: A259079 A259080 A259081 * A259083 A259084 A259085

Keyword

sign,fini,full,base

Author

N. J. A. Sloane, Jun 18 2015

Status

approved