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 A277028 #13 Sep 26 2016 03:31:24 %S A277028 0,1,3,7,31,255,32767 %N A277028 Numbers that are never pandigital for any base b > 1. %C A277028 Here, a number is considered pandigital in base b if any digit from 0 to b-1 appears at least once in its base b representation (ignoring leading zeros). %C A277028 This is a subsequence of A000225, conjectured to be finite (no other term below 2^1000000). %C A277028 No other terms below 2^10^10. - _Charles R Greathouse IV_, Sep 26 2016 %H A277028 Rémy Sigrist, <a href="/A277028/a277028.gp.txt">PARI/GP program for A277028</a> %e A277028 32767 is not pandigital in any base b between 2 and 6: %e A277028 b 32767 in base b Missing digits %e A277028 - --------------- -------------- %e A277028 2 111111111111111 0 %e A277028 3 1122221121 0 %e A277028 4 13333333 0, 2 %e A277028 5 2022032 1, 4 %e A277028 6 411411 0, 2, 3, 5 %e A277028 Moreover, 32767 is too small to be pandigital in any base b > 6, hence 32767 is in the sequence. %o A277028 (PARI) See Sigrist link. %Y A277028 Cf. A055085, A171102. %K A277028 nonn,base %O A277028 1,3 %A A277028 _Rémy Sigrist_, Sep 25 2016