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 A291884 #6 Sep 05 2017 08:44:26 %S A291884 19,28,29,37,38,39,46,47,48,49,55,56,57,58,59,64,65,66,67,68,69,73,74, %T A291884 75,76,77,78,79,82,83,84,85,86,87,88,89,91,92,93,94,95,96,97,98,99, %U A291884 119,128,129,137,138,139,146,147,148,149,155,156,157,158,159,164,165 %N A291884 Complement of A039691. %e A291884 46*11 = 506 while 64*11 = 704 where 704 is not the reverse of 506, so 46 is a term. %o A291884 (PARI) isok(n) = my(d = digits(n), y = n*11); fromdigits(Vecrev(digits(y))) != fromdigits(Vecrev(d))*11; %Y A291884 Cf. A039691. %K A291884 nonn,base %O A291884 1,1 %A A291884 _Michel Marcus_, Sep 05 2017