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%I #9 Dec 27 2019 09:56:04
%S 2,2,2,16,2,24,8,66,6,38,44,142,116,20,460,2974,5774,1110,2520,3422
%N Least k such that k*M#(n) - 1 is prime where M#(n) is the product of the first n Mersenne primes.
%e 2*(2^2-1)*(2^3-1)*(2^5-1) - 1 = 1301, which is prime, so k(3)=2.
%K hard,more,nonn
%O 1,1
%A _Pierre CAMI_, Oct 17 2004
%E a(15)-a(20) from _Donovan Johnson_, Mar 23 2008
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