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Prime power decimal palindromes that are not prime.
2

%I #17 Mar 01 2023 04:43:59

%S 1,4,8,9,121,343,1331,10201,14641,94249,1030301,104060401,

%T 900075181570009,10022212521222001,12124434743442121,

%U 12323244744232321,12341234943214321,1022321210249420121232201,1210024420147410244200121

%N Prime power decimal palindromes that are not prime.

%C A084092 without A002385.

%C a(n) = A072037(n-1) for n > 1. - _Georg Fischer_, Oct 19 2018

%H Donovan Johnson, <a href="/A084093/b084093.txt">Table of n, a(n) for n = 1..27</a> (terms < 10^30)

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PalindromicPrime.html">Palindromic Prime</a>.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PrimePower.html">Prime Power</a>.

%e a(9)=14641=11^4; a(10)=94249=307^2=A000040(63)^2;

%e a(11)=1030301=101^3=A000040(26)^3.

%Y Cf. A002385, A072037, A084092.

%K nonn,base

%O 1,2

%A _Reinhard Zumkeller_, May 11 2003

%E a(13)-a(17) from _Donovan Johnson_, Feb 22 2008

%E Missing term 104060401 added by _Donovan Johnson_, Jul 02 2011