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 A039657 #12 Aug 11 2024 14:41:31 %S A039657 4,45,465,4676,46548,462462,4598113,45549645,459768842,4542783435, %T A039657 45319909593,454084412972 %N A039657 Number of digits in all (2n+1)-digit palindromic primes. %D A039657 For 17-digit palindromic primes, work of Martin Eibl, Carlos Rivera and Warut Roonguthai on De Geest's website %H A039657 P. De Geest, <a href="https://www.worldofnumbers.com/palprim1.htm">World!Of Palindromic Primes, Page 1</a> %F A039657 a(n) = (2n+1)*A040025(n). - _Michel Marcus_, Jul 24 2015 %e A039657 There are 5172 9-digit palindromic primes, 5172*9 = 46548 digits. %Y A039657 Cf. A040025. %K A039657 nonn,base,more %O A039657 0,1 %A A039657 _Enoch Haga_ %E A039657 a(9)-a(11) from A040025 by _Michel Marcus_, Jul 24 2015