A124111 Primes with record large values of the second smallest positive primitive root.

5, 7, 11, 23, 31, 191, 409, 1151, 2161, 2689, 3361, 4729, 9601, 14281, 23209, 31249, 33049, 55441, 71761, 110881, 2116921, 3384481, 5109721, 222855361, 288940681, 567719161, 831143041, 899978641

Offset

1,1

Comments

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

Links

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

Example

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.

Crossrefs

Cf. A002230.

Sequence in context: A174332 A248595 A266233 * A151715 A382254 A226027

Adjacent sequences: A124108 A124109 A124110 * A124112 A124113 A124114

Keyword

nonn,more

Author

Ken Takusagawa, Nov 27 2006

Status

approved