A070270 Primes for which the smallest positive primitive root is even and nonprime.

41, 109, 151, 229, 251, 271, 313, 337, 367, 733, 761, 971, 991, 1021, 1031, 1069, 1289, 1297, 1303, 1429, 1471, 1489, 1759, 1783, 1789, 1811, 1871, 1873, 1879, 2137, 2411, 2441, 2551, 2749, 2791, 2971, 3001, 3061, 3079, 3109, 3221, 3229, 3251, 3301

Offset: 1

Author

Benoit Cloitre, May 09 2002

Keywords

• easy
• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A047936, A001918.

Programs

Mathematica

Select[Prime[Range[500]],EvenQ[PrimitiveRoot[#]]&&PrimitiveRoot[#]!=2&] (* Harvey P. Dale, Jul 31 2015 *)

PARI

forprime(n=1,5000,if((-1)^(lift(znprimroot(n))*(1-isprime(lift(znprimroot(n)))))==1+isprime(lift(znprimroot(n))),print1(n,",")))