1,1
A number n is called (m,k)-perfect if sigma^m(n) = k*n. A019294(n) gives minimal values of m for n. a(n) are the values where A019294(n) > n.
Corresponding values of m and k are in A111726, A111727.
Graeme L. Cohen and Herman J. J. te Riele, Iterating the sum-of-divisors function Experimental Mathematics, 5 (1996), p 94.
Sequence in context: A018743 A077279 A196190 * A111693 A100032 A069350
Adjacent sequences: A111224 A111225 A111226 * A111228 A111229 A111230
hard,nonn
Lambert Klasen (lambert.klasen(AT)gmx.net), Oct 26 2005
