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%I #6 Sep 04 2017 19:26:58
%S 2,2,2,2,2,13,2,13,2,13,2,5,13,5,2,13,13,11,5,2,13,5,3,11,5,577,13,11,
%T 5,577,2,5,13,5,13,7,11,19,5,577,2,7,13,17,5,577,3,37,11,29,13,5,577,
%U 577,7,7,11,19,5,23,577,577,2,7,5,19,17,13,5,577,3,577,7,17,11,29,19,101,5
%N Largest prime factor of peak values of 3x+1 trajectory started at n.
%F a(n) = A006530(A025586(n)).
%e n=27: peak = 9232 = 2*2*2*2*577, so a(27)=577;
%e more extensive search suggests that all primes may occur as largest prime factor of peak.
%Y Cf. A006530, A025586.
%K nonn
%O 2,1
%A _Labos Elemer_, Jun 14 2004
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