%I #8 Feb 16 2025 08:33:00
%S 2,111,212,12121,20102,22122,1001001,1021201,1111111,1201021,1221221,
%T 2001002,2021202,2101012,2111112,2121212,2201022,2211122,102111201,
%U 110111011
%N Palindromic primes in base 3 (written in base 3).
%H R. J. Mathar, <a href="/A117698/b117698.txt">Table of n, a(n) for n = 1..179</a>
%H Eric Weisstein: <a href="https://mathworld.wolfram.com/PalindromicPrime.html">Palindromic Prime</a>.
%Y Cf. A029971.
%K nonn,base,changed
%O 1,1
%A _Martin Renner_, Apr 13 2006