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A039936 Smallest k for which k, 2k, ... nk all contain the digit 5. 9

%I

%S 5,25,25,125,125,125,125,625,625,625,625,625,625,625,625,3125,3125,

%T 3125,3125,3125,3125,3125,3125,3125,3125,3125,3125,3125,3125,3125,

%U 3125,15625,15625,15625,15625,15625,15625,15625,15625,15625,15625,15625

%N Smallest k for which k, 2k, ... nk all contain the digit 5.

%H Giovanni Resta, <a href="/A039936/b039936.txt">Table of n, a(n) for n = 1..10000</a>

%e a(3)=25 since 25, 50, and 75 all contain a 5.

%Y Cf. A039932, A039933, A039934, A039935, A039937, A039938, A039939, A039940.

%K base,nonn

%O 1,1

%A _Erich Friedman_

%E More terms from _Patrick De Geest_, Oct 15 1999

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Last modified June 1 07:40 EDT 2020. Contains 334759 sequences. (Running on oeis4.)