

A219461


Primes p such that 2^p  1 is a prime with primitive root 3.


0




OFFSET

1,1


COMMENTS

If A096393(n) = 3, then A000043(n) belongs to this sequence.
2^a(n)  1 is in A001123.
The first term that is unknown is a(9), which is either 2203 or 2281.


LINKS

Table of n, a(n) for n=1..8.
Discussion titled Conjecture about multiplicative order of 3 modulo a Mersenne prime, (postings in mersenneforum.org), starting May 14 2006.
Index entries for primes by primitive root


MATHEMATICA

Select[Prime@Range[98], PrimitiveRoot[2^#  1] == 3 &]


CROSSREFS

Subsequence of A000043.
Sequence in context: A331800 A062547 A125739 * A122853 A137258 A053341
Adjacent sequences: A219458 A219459 A219460 * A219462 A219463 A219464


KEYWORD

hard,more,nonn


AUTHOR

Arkadiusz Wesolowski, Nov 20 2012


STATUS

approved



