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 A010343 #23 Feb 16 2025 08:32:32 %S A010343 1,2,3,130,131,203,223,313,332,1103,3303 %N A010343 Base-4 Armstrong or narcissistic positive numbers. %H A010343 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/NarcissisticNumber.html">Narcissistic Number</a> %H A010343 D. T. Winter, <a href="http://ftp.cwi.nl/dik/Armstrong">Table of Armstrong Numbers</a> %F A010343 a(n) = A007090(A010344(n)). - _M. F. Hasler_, Nov 18 2019 %o A010343 (PARI) [fromdigits(digits(n,4))|n<-A010344] \\ _M. F. Hasler_, Nov 18 2019 %Y A010343 Cf. A010344 (a(n) written in base 10). %Y A010343 In other bases: A010345 (base 5), A010347 (base 6), A010349 (base 7), A010351 (base 8), A010352 (base 9), A005188 (base 10). %K A010343 base,fini,full,nonn %O A010343 1,2 %A A010343 _N. J. A. Sloane_ %E A010343 Edited by _Joseph Myers_, Jun 28 2009 %E A010343 "Positive" added to definition. - _N. J. A. Sloane_, Nov 18 2019