%N Irregular table: Row n (of A001221(n) terms, for n>=2) consists of the largest powers that divides n of each distinct prime that divides n. Terms are arranged by the sizes of the prime-powers. Row 1 = (1).
%C In other words, except for row 1, row n contains the unitary prime power divisors of n. - Franklin T. Adams-Watters, May 05 2011
%e 60 has the prime factorization of 2^2 * 3^1 * 5^1. So row 60 is, arranged by the sizes of the prime-powers, (3,4,5).
%Y Cf. A141809, A027748.
%A _Leroy Quet_, Jul 07 2008