Numbers n such that maximal value of prime divisors of reduced residue system for n is 4.
211, 221, 223, 227, 229, 233, 239, 241, 247, 251, 253, 257, 263, 269, 271, 277, 281
1 seqfan posts
Mon Mar 22 00:22:20 CET 2010 [seqfan] Re: Cross-References to A006820