%I #13 Feb 21 2021 14:03:44
%S 1,51,51,531,2571,2571,2571,15703,15703,15703,15703,15703,15703,15703,
%T 90271,90271,90271,90271,90271,90271,90271,90271,102053,530102,530102,
%U 530102,530102,530102,530102,530102,530102,530102,530102,530102,530102
%N Smallest number k for which k, 2k, ... nk all contain the digit 1.
%C There are relatively few distinct terms in this sequence. The following list shows the frequencies of a(n) for n=1..2443. - _Georg Fischer_, Feb 21 2021
%C 1 1
%C 2 51
%C 1 531
%C 3 2571
%C 7 15703
%C 8 90271
%C 1 102053
%C 15 530102
%C 5 4550102
%C 1 4570102
%C 4 4580102
%C 49 22900501
%C 53 134003006
%C 93 1002003005
%C 200 5001002003
%C 1 5003001002
%C 223 30005001002
%C 1 30005002001
%C 576 200030005001
%C 1199 1000200030005
%H Giovanni Resta, <a href="/A039932/b039932.txt">Table of n, a(n) for n = 1..2443</a>
%e a(3)=51 since 51, 102, and 153 all contain a 1.
%Y Cf. A039933, A039934, A039935, A039936, A039937, A039938, A039939, A039940.
%K nonn,base
%O 1,2
%A _Erich Friedman_
%E More terms from _Patrick De Geest_, Oct 15 1999
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