%I #24 Feb 28 2014 09:13:22
%S 1,1,1,1,1,2,3,3,2,3,1,1,3,1,2,4,5,5,5,2,3,2,4,4,7,5,4,7,1,9,6,3,6,5,
%T 13,10,2,1,7,3,6,5,5,5,9,3,2,5,9,7,11,1,3,5,10,5,7,3,3,5,9,4,5,11,8,5,
%U 9,8,11,9,9,13,9,11,11,9,5,3,11,11,3,7,3,9,1,10,7,9,3,7,7,11,9,6,9,16,5,6,9,5,9,15,11,12,3,19,7,7,3,1,19,7,9,11,4,19,5,9,7,11,13,11,1,7,15,7,15,18,11,7,5,19,15,12,7,19,14,9,7,11,3,13,10,13,16,11,9,11,7,3
%N Minimal of max(m,k) (m>=1,k>=0) such that (2*n-1)!!/m+2^k is prime.
%o (PARI) a(n)=my(m=-1,P=prod(i=2,n,2*i-1)); while(m+=2, for(k=m-2,m-1, forstep(M=1,m-2,2, if(ispseudoprime(P/M+2^k),return(k)))); for(k=0,m, if(ispseudoprime(P/m+2^k),return(m)))) \\ _Charles R Greathouse IV_, Feb 27 2013
%Y Cf. A212281, A212282, A212321, A212636, A212637, A212648, A213366.
%K nonn
%O 1,6
%A _Vladimir Shevelev_, Feb 15 2013
%E Terms beginning with a(6) were calculated by _Peter J. C. Moses_.