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 A382413 #8 Mar 26 2025 21:48:50 %S A382413 0,7,14,21,28,35,42,49,50,51,52,53,54,55,56,63,70,77,84,91,98,99,100, %T A382413 101,102,103,104,105,112,119,126,133,140,147,148,149,150,151,152,153, %U A382413 154,161,168,175,182,189,196,197,198,199,200,201,202,203,210,217,224,231,238 %N A382413 Numbers with at least one zero in their base-7 representation. %H A382413 Paolo Xausa, <a href="/A382413/b382413.txt">Table of n, a(n) for n = 1..10000</a> %t A382413 Select[Range[0, 250], DigitCount[#, 7, 0] > 0 &] %Y A382413 Cf. analogous sequences in other bases: A062289 (base 2), A081605 (base 3), A196032 (base 4), A382415 (base 5), A382416 (base 6), A382417 (base 8), A382418 (base 9), A011540 (base 10). %Y A382413 Cf. A007093, A043393, A382412 (complement). %K A382413 nonn,base,easy %O A382413 1,2 %A A382413 _Paolo Xausa_, Mar 24 2025