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 A030704 #35 Feb 16 2025 08:32:35 %S A030704 0,1,2,3,5,6,8,9,11,12,13,17,24,27 %N A030704 Numbers k such that the decimal expansion of 8^k contains no zeros (probably finite). %C A030704 Integers in A007377 / 3. - _M. F. Hasler_, Mar 07 2014 %H A030704 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Zero.html">Zero</a> %t A030704 Select[Range[0,30],DigitCount[8^#,10,0]==0&] (* _Harvey P. Dale_, Jul 13 2016 *) %o A030704 (PARI) select( is(n)=vecmin(digits(8^n)), [0..30]) \\ _M. F. Hasler_, Mar 07 2014 %o A030704 (Magma) [n: n in [0..500] | not 0 in Intseq(8^n)]; // _Vincenzo Librandi_, Mar 08 2014 %Y A030704 Cf. A007377 (analog for 2^n), A030700 (for 3^n), A030701 (for 4^n), A008839 (for 5^n), A030702 (for 6^n), A030703 and A195908 (for 7^n), A030705 (for 9^n), A030706 and A195946 (for 11^n), A195944 and A195945 (for 13^n). %Y A030704 Cf. A195942, A195943. %Y A030704 This is row 0 of A305928. %K A030704 nonn,base %O A030704 1,3 %A A030704 _Eric W. Weisstein_ %E A030704 Several edits (offset 1, initial 0, title rephrased) by _M. F. Hasler_, Mar 07 2014