1,2
a(n) <= n with equality iff n belongs to sequence A051532.
a(6) = 3 because there are two groups of order 6, the cyclic group with 6 classes and S_3 with 3 classes.
A051532.
Sequence in context: A140271 A141295 A134198 * A081810 A071829 A067620
Adjacent sequences: A060650 A060651 A060652 * A060654 A060655 A060656
nonn
Noam Katz (noamkj(AT)hotmail.com), Apr 17 2001