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Palindromic primes in base 3 (written in base 3).
5

%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