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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. 1
58, 42, 1, 23, 55, -1, 45, 53, 24, 65 (list; graph; refs; listen; history; text; internal format)
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 * A105326 A247096 A276186

Adjacent sequences:  A259079 A259080 A259081 * A259083 A259084 A259085

KEYWORD

sign,fini,full,base

AUTHOR

N. J. A. Sloane, Jun 18 2015

STATUS

approved

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Last modified January 23 16:48 EST 2020. Contains 331173 sequences. (Running on oeis4.)