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 A069590 #16 Jun 22 2024 15:00:51
%S A069590 2,23,211,2003,20011,200003,2000003,20000003,200000033,2000000011,
%T A069590 20000000089,200000000041,2000000000003,20000000000021,
%U A069590 200000000000027,2000000000000021,20000000000000003,200000000000000003,2000000000000000057,20000000000000000011
%N A069590 Smallest n-digit prime starting with a 2.
%H A069590 Robert Israel, <a href="/A069590/b069590.txt">Table of n, a(n) for n = 1..996</a>
%p A069590 seq(nextprime(2*10^(n-1)-1), n=1..22);
%t A069590 Join[{2}, NextPrime[2*10^Range[20]]] (* _Paolo Xausa_, Jun 22 2024 *)
%Y A069590 Cf. A069588, A069589.
%K A069590 base,nonn
%O A069590 1,1
%A A069590 _Amarnath Murthy_, Mar 25 2002
%E A069590 More terms from _Sascha Kurz_, Mar 28 2002
%E A069590 Simpler definition from _Robert Israel_, Jun 21 2024