Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
1,2
Table of n, a(n) for n=1..20.
A primitive root of 2 must be == 1 (mod 2); for 3, it must be == 2 (mod 3), and for 5 it must be == 2 or 3 (mod 5). The smallest such number is 17, so a(3)=17.
Cf. A001918, A060749.
Sequence in context: A096896 A056850 A237437 * A141558 A231710 A040153
Adjacent sequences: A128892 A128893 A128894 * A128896 A128897 A128898
nonn
Martin Raab, Apr 20 2007
approved