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 A010346 #24 Feb 16 2025 08:32:32
%S A010346 1,2,3,4,13,18,28,118,289,353,419,4890,4891,9113,1874374,338749352,
%T A010346 2415951874
%N A010346 Base-5 Armstrong or narcissistic numbers (written in base 10).
%C A010346 Zero would also satisfy the definition as the other single-digit terms, but here only positive numbers are considered. - _M. F. Hasler_, Nov 20 2019
%H A010346 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/NarcissisticNumber.html">Narcissistic Number</a>
%H A010346 D. T. Winter, <a href="http://ftp.cwi.nl/dik/Armstrong">Table of Armstrong Numbers</a>
%o A010346 (PARI) A010346=select( is_A010346(n)={n==vecsum([d^#n|d<-n=digits(n,5)])}, [0..9999]) \\ This yields only terms < 10^4 (i.e., all but the last 3 terms), for illustration of is_A010346(). In older versions of PARI, use {n==sum(i=1,#n=digits(n,5),n[i]^#n)}. - _M. F. Hasler_, Nov 20 2019
%Y A010346 Cf. A010345 (a(n) written in base 5).
%Y A010346 In other bases: A010344 (base 4), 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 A010346 base,fini,full,nonn
%O A010346 1,2
%A A010346 _N. J. A. Sloane_
%E A010346 Edited by _Joseph Myers_, Jun 28 2009