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Bisection of Mersenne primes A000668.
3

%I #2 Mar 30 2012 17:33:50

%S 7,127,131071,2147483647,618970019642690137449562111

%N Bisection of Mersenne primes A000668.

%F a(n) = A000668(2*n).

%e a(3) = 131071 because the (2*3=6)th Mersenne prime is 131071.

%Y Cf. A000668, A134721.

%K easy,nonn

%O 1,1

%A _Omar E. Pol_, Nov 11 2007