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 A030522 #20 Dec 29 2018 15:36:02
%S A030522 1,5,29,209,2309,233309,30563609,4615105109,835334024909,
%T A030522 159548798757809,49938774011194529,17628387225951669089,
%U A030522 6575388435279972570569,2518373770712229494528309
%N A030522 Product of first n palindromic primes minus 1.
%C A030522 The subsequence which are themselves primes begins: 5, 29, 2309, 4615105109, 2518373770712229494528309. - _Jonathan Vos Post_, Feb 09 2011
%H A030522 Harvey P. Dale, <a href="/A030522/b030522.txt">Table of n, a(n) for n = 1..199</a>
%t A030522 palQ[n_]:=Module[{idn=IntegerDigits[n]},idn==Reverse[idn]]; #-1&/@Rest[ FoldList[ Times,1,Select[Prime[Range[200]],palQ]]] (* _Harvey P. Dale_, Jun 21 2011 *)
%t A030522 FoldList[Times,Select[Prime[Range[100]],PalindromeQ]]-1 (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Dec 29 2018 *)
%Y A030522 Cf. A019515, A030521.
%K A030522 nonn,base
%O A030522 1,2
%A A030522 _Felice Russo_
%E A030522 Corrected and extended by Larry Reeves (larryr(AT)acm.org), Sep 25 2000
%E A030522 Corrected by _D. S. McNeil_, Aug 20 2010