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%I #5 May 01 2015 12:43:03
%S 2,2,2,3,2,2,3,2,3,2,2,3,2,2,3,5,2,3,2,5,2,3,2,3,2,5,2,3,2,5,2,3,7,2,
%T 3,5,2,2,3,7,2,5,3,2,2,7,3,5,2,3,2,5,2,7,3,2,2,3,5,7,2,3,2,5,2,3,7,2,
%U 5,3,2,2,3,7,2,5,2,3,11,2,7,5,3,2,2,3
%N Prime root of n-th term in A257278.
%C a(n) = A020639(A257278(n));
%C A257278(n) = a(n) ^ A257573(n);
%C a(n) <= A257573(n) by definition of A257278.
%H Reinhard Zumkeller, <a href="/A257572/b257572.txt">Table of n, a(n) for n = 1..10000</a>
%o (Haskell)
%o a257572 = a020639 . a257278
%Y Cf. A257278, A020639, A025473, A257573.
%K nonn
%O 1,1
%A _Reinhard Zumkeller_, May 01 2015
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