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 A018862 #19 Aug 19 2025 16:36:21 %S A018862 0,2,5,11,1,4,7,50,10,63,23,3,56,26,6,69,49,29,9,82,62,42,22,12,2,75, %T A018862 55,45,25,15,5,88,68,58,48,38,28,18,8,91,81,71,61,51,41,31,21,11,104, %U A018862 94,84,74,167,64,54,44,137,34,24,117,14,4,97,87,180,77,67,160,57,150,47,37,130 %N A018862 5^a(n) is smallest power of 5 beginning with n. %H A018862 D. Mondot, <a href="/A018862/b018862.txt">Table of n, a(n) for n=1..32699</a> %o A018862 (PARI) a(n) = my(k=0, ss=Str(n)); while(strsplit(Str(5^k), ss)[1] != "", k++); k; \\ _Michel Marcus_, Aug 19 2025 %Y A018862 Cf. A018861. %Y A018862 Cf. A018858, A018860, A018864, A018866, A018868, A062525, A062526. %K A018862 nonn,base %O A018862 1,2 %A A018862 _David W. Wilson_