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 A154818 #5 Mar 09 2023 15:30:51 %S A154818 69636,70215,77058,80892 %N A154818 Numbers k such that k^4 contains every digit exactly twice. %C A154818 77058^4 = 35259076387041812496, which contains 2 of each digit 0-9. There are just 4 terms. %Y A154818 Cf. A054038, A074205, A154532, A154566. %K A154818 base,easy,nonn,fini,full %O A154818 1,1 %A A154818 _Zhining Yang_, Jan 15 2009 %E A154818 Keywords fini and full added. - _R. J. Mathar_, Jan 17 2009