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 A287961 #5 Feb 16 2025 08:33:47
%S A287961 4,5,6,7,8,9,10,12,13,14,16,18,22,103,104,106,108,112,133,134,136,138,
%T A287961 142,153,154,156,158,162,183,184,186,188,192,193,194,196,198,202,232,
%U A287961 252,262,282,292,302,312,315,316,318,320,322,324,332,342,355,356,358,360,362,364,372,375,376,378,380
%N A287961 Numbers that are the sum of two palindromic primes (A002385).
%H A287961 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PalindromicPrime.html">Palindromic Prime</a>
%H A287961 <a href="/index/Pac#palindromes">Index entries for sequences related to palindromes</a>
%t A287961 nmax = 380; f[x_] := Sum[Boole[PalindromeQ[k] && PrimeQ[k]] x^k, {k, 1, nmax}]^2; Exponent[#, x] & /@ List @@ Normal[Series[f[x], {x, 0, nmax}]]
%Y A287961 Cf. A002113, A002385, A014091, A035137, A260254, A260255, A261906.
%K A287961 nonn,base
%O A287961 1,1
%A A287961 _Ilya Gutkovskiy_, Jun 03 2017