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 A228075 #10 Apr 28 2019 18:27:58 %S A228075 3,5,7,8,11,17,21,27,29,33,39,41,47,53,57,59,63,69,71,77,81,83,87,89, %T A228075 93,95,97,98,113,117,119,123,137,141,143,147,161,171,173,177,179,189, %U A228075 191,203,213,227,231,239,243,249,257,261,267,273,281,291,299 %N A228075 Numbers n whose 10's complement is prime, i.e., 10^k-n, where k is the number of digits of n, is prime. %C A228075 A068811 is a subset. %H A228075 Jayanta Basu, <a href="/A228075/b228075.txt">Table of n, a(n) for n = 1..1000</a> %e A228075 8 is a term since 10^1 - 8 = 2 is a prime. %e A228075 Similarly, 39 is a term as 10^2 - 39 = 61 is prime. %t A228075 Select[Range[300], PrimeQ[10^(IntegerLength[#]) - #] &] %Y A228075 Cf. A068811. %K A228075 nonn,base %O A228075 1,1 %A A228075 _Jayanta Basu_, Aug 09 2013