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 A256350 #15 Apr 10 2024 09:16:11 %S A256350 4,6,12,26,27,35,38,45,46,48,49,50,52,56,57,58,63,64,65,66,68,77,81, %T A256350 82,84,85,88,95,105,116,117,118,119,121,122,134,136,138,142,153,154, %U A256350 161,165,166,171,175,176,187,188,190,192,195,207,208,218,219,220,225 %N A256350 Composites in base 10 that remain composite in exactly eight bases b, 2 <= b <= 10, expansions interpreted as decimal numbers. %H A256350 Sebastian Petzelberger, <a href="/A256350/b256350.txt">Table of n, a(n) for n = 1..10000</a> %H A256350 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_024.htm">PP&P Puzzle 24: Primes in several bases</a>, The Prime Puzzles & Problems Connection. %Y A256350 Cf. A052026, A256350-A256356, A038537, A052027-A052033, A084482, A236356. %K A256350 nonn,base %O A256350 1,1 %A A256350 _Sebastian Petzelberger_, Mar 25 2015