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A070269 Primes for which the smallest positive primitive root is odd and nonprime. 1
2, 409, 439, 3631, 4441, 4657, 8681, 12841, 15889, 16633, 21559, 22751, 28393, 30091, 30937, 32257, 32353, 33811, 33871, 36793, 36871, 41809, 41851, 42193, 46649, 48673, 51631, 55921, 58237, 59053, 59497, 60889, 63691, 64609, 71011 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..35.

MATHEMATICA

onpQ[n_]:=Module[{pr=PrimitiveRoot[n, 1]}, OddQ[pr]&&!PrimeQ[pr]]; Select[ Prime[ Range[7100]], onpQ]  (* Harvey P. Dale, Jun 22 2020 *)

PROG

(PARI) forprime(n=1, 100000, if((-1)^(lift(znprimroot(n))*(1-isprime(lift(znprimroot(n)))))==-1, print1(n, ", ")))

CROSSREFS

Cf. A047936, A001918.

Sequence in context: A214597 A283661 A067827 * A153911 A259562 A177321

Adjacent sequences:  A070266 A070267 A070268 * A070270 A070271 A070272

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, May 09 2002

STATUS

approved

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Last modified October 15 21:38 EDT 2021. Contains 348034 sequences. (Running on oeis4.)