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A219461
Primes p such that 2^p - 1 is a prime with primitive root 3.
0
3, 5, 7, 17, 19, 89, 107, 521, 2203, 2281, 4253
OFFSET
1,1
COMMENTS
If A096393(n) = 3, then A000043(n) belongs to this sequence.
2^a(n) - 1 is in A001123.
a(12) >= 21701. - Max Alekseyev, Feb 08 2024
MATHEMATICA
Select[Prime@Range[98], PrimitiveRoot[2^# - 1] == 3 &]
CROSSREFS
Subsequence of A000043.
Sequence in context: A331800 A062547 A125739 * A122853 A137258 A053341
KEYWORD
hard,more,nonn
AUTHOR
EXTENSIONS
a(9)-a(11) from Max Alekseyev, Feb 07 2024
STATUS
approved