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 A034082 #18 Sep 21 2022 12:22:52
%S A034082 21,4,6,8,12,18,26,39,58,87,130,195,292,438,657,986,1478,2217,3326,
%T A034082 4988,7482,11223,16835,25252,37877,56816,85223,127835,191752,287627,
%U A034082 431440,647160,970740,1456110,2184165,3276247,4914370,7371555,11057333
%N A034082 a(n) = least integer m such that the part after the decimal point of the n-th root of m starts with the digit 5.
%F A034082 For n > 2: a(n) = ceiling((3/2)^n) = A002379(n) + 1. - _Henry Bottomley_, May 02 2001
%e A034082 a(25)=25252 -> 25252^(1/25)=1.{5}000019762083...
%o A034082 (Python)
%o A034082 def A034082(n): return (3**n>>n)+1 if n > 2 else 21 # _Chai Wah Wu_, Sep 21 2022
%Y A034082 Cf. A034062, A034072, A002379, A061418, A061419.
%K A034082 nonn,base
%O A034082 2,1
%A A034082 _Patrick De Geest_, Sep 15 1998
%E A034082 Definition clarified by _N. J. A. Sloane_, May 24 2021