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A213051 Primes of the form 4*k+3 with primitive root +2. 3
3, 11, 19, 59, 67, 83, 107, 131, 139, 163, 179, 211, 227, 347, 379, 419, 443, 467, 491, 523, 547, 563, 587, 619, 659, 787, 827, 859, 883, 907, 947, 1019, 1091, 1123, 1171, 1187, 1259, 1283, 1291, 1307, 1427, 1451, 1483, 1499, 1523, 1531, 1571, 1619, 1667, 1747 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes with primitive root +2 where -2 is not a primitive root.

A001122 == A213050 union A213051.

LINKS

Table of n, a(n) for n=1..50.

Christian Elsholtz, Almost all primes have a multiple of small Hamming weight, arXiv:1602.05974 [math.NT], 2016. See p. 6.

MATHEMATICA

Select[Prime[Range[300]], Mod[#, 4] == 3 && PrimitiveRoot[#, 2] == 2&] (* Jean-Fran├žois Alcover, Jul 22 2018 *)

PROG

(PARI)

{ forprime (p=3, 10^4,

    rp = znorder(Mod(+2, p));

    rm = znorder(Mod(-2, p));

    if ( (rp==p-1) && (rm!=p-1), print1(p, ", ") );

); }

CROSSREFS

Cf. A213050 (primes 4*k+1 with primitive root +2), A001122 (primitive root +2).

Sequence in context: A309027 A213891 A163851 * A238362 A116945 A048270

Adjacent sequences:  A213048 A213049 A213050 * A213052 A213053 A213054

KEYWORD

nonn

AUTHOR

Joerg Arndt, Jun 03 2012

STATUS

approved

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Last modified August 8 19:29 EDT 2020. Contains 336298 sequences. (Running on oeis4.)