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 A043364 #19 Apr 24 2021 03:24:13 %S A043364 468,1093,1718,1968,2093,2218,2268,2293,2318,2328,2333,2338,2340,2341, %T A043364 2342,2344,2348,2368,2468,2968,3593,4218,4843,5093,5218,5343,5393, %U A043364 5418,5443,5453,5458,5463,5465,5466,5467,5469,5473 %N A043364 Numbers having four 3's in base 5. %H A043364 David A. Corneth, <a href="/A043364/b043364.txt">Table of n, a(n) for n = 1..10000</a> %o A043364 (PARI) isok(k) = #select(x->(x==3), digits(k, 5)) == 4; \\ _Michel Marcus_, Apr 24 2021 %Y A043364 Cf. A007091. %K A043364 nonn,base %O A043364 1,1 %A A043364 _Clark Kimberling_