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 A010344 #19 Feb 16 2025 08:32:32 %S A010344 1,2,3,28,29,35,43,55,62,83,243 %N A010344 Base-4 Armstrong or narcissistic numbers (written in base 10). %H A010344 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/NarcissisticNumber.html">Narcissistic Number</a> %H A010344 D. T. Winter, <a href="http://ftp.cwi.nl/dik/Armstrong">Table of Armstrong Numbers</a> %o A010344 (PARI) A010344=select( n->n==vecsum([d^#n|d<-n=digits(n,4)]), [0..333]) \\ _M. F. Hasler_, Nov 18 2019 %Y A010344 Cf. A010343 (a(n) written in base 4). %Y A010344 In other bases: A010346 (base 5), A010348 (base 6), A010350 (base 7), A010354 (base 8), A010353 (base 9), A005188 (base 10), A161948 (base 11), A161949 (base 12), A161950 (base 13), A161951 (base 14), A161952 (base 15), A161953 (base 16). %K A010344 base,fini,full,nonn %O A010344 1,2 %A A010344 _N. J. A. Sloane_ %E A010344 Edited by _Joseph Myers_, Jun 28 2009