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 A050698 #7 Oct 16 2019 01:31:48
%S A050698 51,74,91,94,104,114,117,119,121,133,136,141,143,154,156,159,164,169,
%T A050698 171,176,178,186,187,194,198,203,207,209,221,253,261,291,299,301,314,
%U A050698 319,338,341,344,346,361,364,368,374,376,377,386,391,394,398,403,404
%N A050698 Numbers that appear in A050695 but not in A035139.
%C A050698 None of the prime factors of a(n) are a substring of a(n) and at least one of the digits of the prime factors of a(n) appears in a(n).
%e A050698 51 = 3*17 -> digit 1 appears in 5{1}.
%Y A050698 Cf. A050695, A035139.
%K A050698 nonn,base
%O A050698 1,1
%A A050698 _Patrick De Geest_, Aug 15 1999