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 A082520 #24 May 14 2021 12:15:12 %S A082520 2,3,5,191,19391,38183,1508051,1609061,1628261,3717173,3916193, %T A082520 161535161,161838161,170646071,172747271,182949281,190909091, %U A082520 352909253,354848453,360818063,364636463,15052625051,15150805151,15253635251 %N A082520 Palindromic Sophie Germain primes: both p and 2p+1 are palindromic primes. %C A082520 Subsequence of A051835 (intersection of A002385 and A005384). %D A082520 H. Dubner, "Palindromic Sophie Germain primes", Journal of Recreational Mathematics, Vol. 26(1):38-41 1994 Baywood Inc. NY %H A082520 Dmitry Petukhov, <a href="/A082520/b082520.txt">Table of n, a(n) for n = 1..804</a> (terms up to 10^15). %H A082520 H. Dubner, <a href="https://web.archive.org/web/20050406043022/http://ksc9.th.com/warut/dubner.html">Palindromic Sophie Germain Primes</a> %e A082520 3916193 is in the sequence because both 3916193 and 2*3916193 + 1 = 7832387 are palindromic primes. %t A082520 Select[Prime@Range@1000000,PalindromeQ@#&&PalindromeQ[2#+1]&&PrimeQ[2#+1]&] (* _Giorgos Kalogeropoulos_, May 14 2021 *) %Y A082520 Cf. A002385, A005384, A051835. %Y A082520 The associated primes are listed in A082565. %K A082520 base,nonn %O A082520 1,1 %A A082520 _Lekraj Beedassy_, Apr 30 2003