Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
These are all composite since for prime p, ord2(p) | phi(p) = p-1, whence p mod ord2(p) = 1.
Table of n, a(n) for n=0..34.
Sequence in context: A054830 A031552 A205253 * A180651 A180331 A043444
Adjacent sequences: A036257 A036258 A036259 * A036261 A036262 A036263
David W. Wilson