%I #8 Feb 26 2018 18:58:28
%S 2,17,254561089305599,8483004771271882804592639999,
%T 706526001186582385898210420541078864497278132689882316799999999,
%U 353401447088718405944982176443380974931403135679741865504466985287679999999999
%N Primes of the form k!*3^k - 1.
%H Robert Price, <a href="/A290189/b290189.txt">Table of n, a(n) for n = 1..7</a>
%H Joe McLean, <a href="http://web.araachive.org/web/20091027034731/http://uk.geocities.com/nassarawa%40btinternet.com/probprim2.htm">Interesting Sources of Probable Primes</a>
%H OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%t Select[Table[k!*3^k - 1, {k, 0, 100}], PrimeQ[#]&]
%Y Cf. A121859.
%K nonn
%O 1,1
%A _Robert Price_, Jul 23 2017