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 A228359 #11 Apr 28 2019 18:27:12 %S A228359 1,2,4,6,9,10,12,13,14,15,16,18,19,20,22,23,24,25,26,28,30,31,32,34, %T A228359 35,36,37,38,40,42,43,44,45,46,48,49,50,51,52,54,55,56,58,60,61,62,64, %U A228359 65,66,67,68,70,72,73,74,75,76,78,79,80,82,84,85,86,88,90,91,92 %N A228359 Numbers n whose 10's complement is not prime, i.e., 10^k-n, where k is the number of digits of n, is not prime. %H A228359 Vincenzo Librandi, <a href="/A228359/b228359.txt">Table of n, a(n) for n = 1..1000</a> %t A228359 Select[Range[100], ! PrimeQ[10^(IntegerLength[#]) - #]&] %Y A228359 Cf. A228075. %K A228359 nonn,easy,base,less %O A228359 1,2 %A A228359 _Vincenzo Librandi_, Aug 21 2013