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%I #15 Jul 05 2018 04:30:14
%S 2,2,2,2,11,11,11,11,11,11,11,3,3,3,3,2,2,2,2,2,2,2,4,2,2,2,2,2,2,2,2,
%T 2,13,5,7,2,2,2,2,2,2,2,2,3,3,3,3,2,2,2,2,2,2,2,2,22,22,22,22,22,22,
%U 22,22,22,11,11,11,11,11,11,11,11,11,11,11,22,22,22,22,22,22,22,22,22,11,55
%N a(n) = gcd(A081939(n), A081939(n+1)).
%H Robert Israel, <a href="/A316497/b316497.txt">Table of n, a(n) for n = 1..10000</a>
%H <a href="/index/Pac#palindromes">Index entries for sequences related to palindromes</a>
%e A081939(3)=6 and A081939(4)=8, so a(3)=gcd(6,8)=2.
%p # with list R containing terms of A081939
%p seq(igcd(R[i],R[i+1]),i=1..nops(R)-1)
%Y Cf. A081939.
%K nonn,base
%O 1,1
%A _Robert Israel_, Jul 04 2018
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