Minimum numbers whose phi of phi are multiples of the n-th prime: the n-th term is the minimum integer x such that: p(n) | phi(phi(x)), p(n) being the n-th prime.
5, 19, 23, 59, 47, 107, 479, 383, 283, 467, 1367, 1187, 167, 347, 1319, 643, 2837
1 seqfan posts
Thu Nov 12 01:31:28 CET 2009 [seqfan] New Unfriendly Sequence: A167781