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 A061663 #15 Aug 25 2023 00:56:28 %S A061663 2890,26010,188722,234090,235954,260416,390688,484094,511234,1621474, %T A061663 1651654,1698498,1953842,2022214,2106810,2123586,2202230,2283388, %U A061663 2296028,2343744,2485838,2496508,2559962,2595386,2627210,2841118,3091018,3118760,3309540,3334316,3483208 %N A061663 Numbers k > 1 such that, in base 9, k and k^2 contain the same digits in the same proportion. %H A061663 Ray Chandler, <a href="/A061663/b061663.txt">Table of n, a(n) for n = 1..1000</a> %e A061663 2890 = 3861_9 and 2890^2 = 16638831_9. %Y A061663 Cf. A061656, A061657, A061658, A061659, A061660, A061661, A061662, A114258, A061664. %K A061663 base,easy,nonn %O A061663 1,1 %A A061663 _Erich Friedman_, Jun 16 2001 %E A061663 More terms from _Naohiro Nomoto_, Oct 04 2001 %E A061663 Offset changed to 1 by _Alois P. Heinz_, May 10 2015 %E A061663 Terms a(13)-a(31) and beyond from _Seiichi Manyama_, Aug 20 2023