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 A256353 #11 Apr 09 2024 16:01:05 %S A256353 55,169,247,253,323,493,529,556,671,1027,1111,1243,1261,1339,1375, %T A256353 1711,1751,1803,2185,2413,2431,2881,3193,4381,4417,4843,5029,5203, %U A256353 5251,6631,7093,7999,8515,8653,9271,9307,9481,9523,9593,9727,9745,9937,9955,10393,10555 %N A256353 Composites in base 10 that remain composite in exactly five bases b, 2 <= b <= 10, expansions interpreted as decimal numbers. %C A256353 Less remaining is not possible for even numbers. %H A256353 Sebastian Petzelberger, <a href="/A256353/b256353.txt">Table of n, a(n) for n = 1..10000</a> %H A256353 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_024.htm">PP&P Puzzle 24: Primes in several bases</a> %Y A256353 Cf. A052026, A256350-A256356, A038537, A052027-A052033, A084482, A236356. %K A256353 nonn,base %O A256353 1,1 %A A256353 _Sebastian Petzelberger_, Mar 25 2015