A082815 Consider primes p with a unique representation p = x^2 + y^2, where x is least primitive root of p. a(n) is the first such prime with x increasing in the sequence, x can be found in A082816.

2, 5, 3061, 398261, 2387221, 8935021, 514613581

Offset

1,1

Comments

A082842 includes all numbers having primitive roots.

Links

Table of n, a(n) for n=1..7.

Example

398261 = 10^2 + 631^2 and 10 is least primitive root of 398261.

Crossrefs

Cf. A001481, A002313, A082816, A082842.

Sequence in context: A082973 A306747 A187604 * A115893 A323338 A057678

Adjacent sequences: A082812 A082813 A082814 * A082816 A082817 A082818

Keyword

nonn,more

Author

Sven Simon, May 24 2003

Extensions

Offset 1 from Michel Marcus, Oct 31 2018

Status

approved