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 A280825 #8 Feb 16 2025 08:33:39 %S A280825 100,101,110,112,113,114,115,116,117,118,119,121,122,131,133,141,144, %T A280825 151,155,161,166,171,177,181,188,191,199,200,202,211,212,220,221,223, %U A280825 224,225,226,227,228,229,232,233,242,244,252,255,262,266,272,277,282,288,292,299,300,303,311,313,322,323,330,331,332,334,335 %N A280825 Numbers with an odd number of digits and with an even number of distinct digits. %H A280825 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Digit.html">Digit</a> %H A280825 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>. %F A280825 A000035(A055642(a(n))) = 1. %F A280825 A000035(A043537(a(n))) = 0. %F A280825 a(n) = A210666(n) for n < 244. %t A280825 Select[Range[335], Mod[Length[IntegerDigits[#1]], 2] == 1 && Mod[Length[Union[IntegerDigits[#1]]], 2] == 0 & ] %Y A280825 Cf. A000035, A001633, A043537, A055642, A210666, A280823, A280824, A280826. %K A280825 nonn,base,easy %O A280825 1,1 %A A280825 _Ilya Gutkovskiy_, Jan 08 2017