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 A222727 #6 Nov 22 2022 19:52:53 %S A222727 7,727,757,787,797,70207,70507,70607,71317,71917,72227,72727,73037, %T A222727 73237,73637,74047,74747,75557,76367,76667,77377,77477,77977,78487, %U A222727 78787,78887,79397,79697,79997,7014107,7035307,7036307,7041407,7046407,7057507,7065607,7069607 %N A222727 Palindromic primes starting with a digit 7. %C A222727 Subsequence of A002385 (palindromic primes) and A002113 (palindromic numbers). Complement of A222728 (palindromic composite numbers starting with a digit 7) with respect to A043042 (palindromic numbers starting with a digit 7). %H A222727 Jaroslav Krizek, <a href="/A222727/b222727.txt">Table of n, a(n) for n = 1..1000</a> %t A222727 Select[Prime[Range[500000]],PalindromeQ[#]&&Mod[#,10]==7&] (* _Harvey P. Dale_, Nov 22 2022 *) %Y A222727 Cf. A002385, A002113, A222728, A043042. %K A222727 nonn,base %O A222727 1,1 %A A222727 _Jaroslav Krizek_, Mar 09 2013