1,1

Sequence begins at the first prime with at least 2 primitive roots, namely 5.

Table of n, a(n) for n=1..28.

The smallest two positive primitive roots of a(26)=567719161 are 43 and 172. No integer less than 567719161 has a second root greater than or equal to 172.

Cf. A002230.

Sequence in context: A174332 A248595 A266233 * A151715 A226027 A090810

Adjacent sequences: A124108 A124109 A124110 * A124112 A124113 A124114

nonn

Ken Takusagawa, Nov 27 2006

approved