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 A018872 #20 Aug 19 2025 16:37:28 %S A018872 0,1,3,2,21,9,23,6,61,25,4,26,66,42,17,69,7,28,18,72,29,116,47,75,3, %T A018872 48,192,77,31,124,79,5,2,32,51,129,205,13,52,33,21,53,212,134,85,34, %U A018872 136,86,137,87,55,22,35,14,352,56,224,142,226,9,36,144,91,363,23,58,146,232,147,37 %N A018872 a(n)^5 is smallest fifth power beginning with n. %H A018872 Seiichi Manyama, <a href="/A018872/b018872.txt">Table of n, a(n) for n = 0..10000</a> %F A018872 a(n^5) = n for n >= 0. - _Seiichi Manyama_, Jan 30 2017 %o A018872 (PARI) a(n) = my(k=0, ss=Str(n)); while(strsplit(Str(k^5), ss)[1] != "", k++); k; \\ _Michel Marcus_, Aug 19 2025 %Y A018872 Cf. A018851 (k=2), A018852 (k=3), A018853 (k=4), this sequence (k=5), A018874 (k=6), A018876 (k=7), A018878 (k=8), A018880 (k=9), A018882 (k=10). %K A018872 nonn,base %O A018872 0,3 %A A018872 _David W. Wilson_ %E A018872 Added initial 0. - _Seiichi Manyama_, Jan 30 2017