1,3

Number of primitive roots in the field with p elements.

T. D. Noe, Table of n, a(n) for n=1..10000

for i from 1 to 500 do if isprime(i) then print(phi(i-1)); fi; od;

Table[ EulerPhi[ Prime@n - 1], {n, 70}] (from Robert G. Wilson v (rgwv(at)rgwv.com), Dec 17 2005)

Cf. A000010.

Sequence in context: A005852 A115209 A139210 this_sequence A138219 A100835 A120541

Adjacent sequences: A008327 A008328 A008329 this_sequence A008331 A008332 A008333

nonn

njas