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 A309406 #14 Nov 16 2019 10:30:10 %S A309406 1,3,7,9,13,15,31,33,37,51,73,99,111,115,151,339,393,511,777,933,9999, %T A309406 33333,55555,111111,777777,7777777,55555555 %N A309406 Absolute lucky numbers: every permutation of digits is a lucky number. %C A309406 More terms are in A031882, as A031882 is a subset of this sequence. %C A309406 No more terms below 10^9. - _Amiram Eldar_, Nov 16 2019 %e A309406 a(6) = 15 because 15 and 51 are lucky numbers. %e A309406 a(14) = 115 because (115, 151, 511) are all lucky numbers. %Y A309406 Cf. A000959, A118561, A031882, A003459. %K A309406 base,nonn,more %O A309406 1,2 %A A309406 _Hauke Löffler_, Jul 29 2019 %E A309406 a(25)-a(27) from _Amiram Eldar_, Nov 16 2019