Number of nonprime numbers (composites and 1) in the reduced residue system of n.
1, 1, 1, 1, 2, 1, 3, 1, 3, 2, 6, 1, 7, 2, 4, 3, 10, 1, 11, 2, 6, 4, 14, 1, 12, 5, 10, 5, 19, 1, 20
1 seqfan posts
Fri Oct 22 23:48:53 CEST 2010 [seqfan] A048864 = A036997 + 1