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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: A060829 A096896 A056850 * A141558 A231710 A040153
Adjacent sequences: A128892 A128893 A128894 * A128896 A128897 A128898
Martin Raab, Apr 20 2007