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 A222725 #6 Aug 20 2013 21:32:33 %S A222725 3,313,353,373,383,30103,30203,30403,30703,30803,31013,31513,32323, %T A222725 32423,33533,34543,34843,35053,35153,35353,35753,36263,36563,37273, %U A222725 37573,38083,38183,38783,39293,3001003,3002003,3007003,3016103,3026203,3064603,3065603,3072703 %N A222725 Palindromic primes starting with a digit 3. %C A222725 Subsequence of A002385 (palindromic primes) and A002113 (palindromic numbers). Complement of A222726 (palindromic composite numbers starting with a digit 3) with respect to A043038 (palindromic numbers starting with a digit 3). %H A222725 Jaroslav Krizek, <a href="/A222725/b222725.txt">Table of n, a(n) for n = 1..1000</a> %Y A222725 Cf. A002385, A002113, A222726, A043038. %K A222725 nonn,base %O A222725 1,1 %A A222725 _Jaroslav Krizek_, Mar 09 2013