%I

%S 1,2,3,2,5,3,2,3,5,3,5,2,3,5,3,5,3,5,2,3,5,5,3,5,3,5,2,3,5,5,3,5,3,5,

%T 3,5,5,2,5,3,5,5,3,5,3,5,3,5,5,3,5,2,5,3,5,5,3,5,5,3,5,5,3,5,5,3,5,2,

%U 5,3,5,5,5,3,5,5,3,5,3,5,5,3,5,5,3,5,2,5,5,3,5,5,5,5,3,5,5,3,5,3,5,5,3,5,5

%N Greatest prime factor of n-th 5-smooth number.

%C a(n) = A006530(A051037(n));

%C A112763(n) <= a(n) <= 5.

%Y Cf. A112756, A086411.

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Sep 18 2005