This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A319542 #6 Nov 20 2018 21:51:53 %S A319542 1,51,531,2571,15703,90271,102053,530102,4550102,4570102,4580102, %T A319542 22900501,134003006,1002003005,5001002003,5003001002,30005001002, %U A319542 30005002001,200030005001,1000200030005,5000100020003,5000300010002 %N A319542 Record values in A039932. %C A319542 The positive integer n belongs to the sequence iff there exists a positive integer k so that each of the first k multiples of n contains the decimal digit 1, but no smaller n has this property for the same value of k. %e A319542 51 is a term because the first three multiples of 51 (51, 102, 153) all contain the digit 1, and 51 is the least positive integer with this property. %Y A319542 Cf. A319548, A039932, A317173. Subset of A011531. %K A319542 nonn,base %O A319542 1,2 %A A319542 _David Radcliffe_, Sep 22 2018