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 A083981 #13 Mar 25 2019 14:00:41
%S A083981 101,10301,1300031,1003001,100404001,100030001,10060006001,
%T A083981 10000500001,1000030300001,1000008000001,140000000000041,
%U A083981 300000020000003,10000003030000001,10000000500000001,1000000400040000001,1000000008000000001,100000000303000000001
%N A083981 Smallest palindromic prime containing exactly n zeros.
%H A083981 Chai Wah Wu, <a href="/A083981/b083981.txt">Table of n, a(n) for n = 1..500</a>
%t A083981 Table[d = 0; i = 1;
%t A083981 While[ x = IntegerDigits[Prime[i]];
%t A083981 x != Reverse[x] || Count[x, d] != n , i++];
%t A083981 FromDigits[x], {n, 1, 5}] (* _Robert Price_, Mar 25 2019 *)
%Y A083981 Cf. A083972, A083973, A083974, A083975, A083976, A083977, A083978, A083979, A083980.
%K A083981 base,nonn
%O A083981 1,1
%A A083981 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 21 2003
%E A083981 Corrected and extended by _Giovanni Resta_, Feb 08 2006