A134722 Bisection of Mersenne primes A000668.
7, 127, 131071, 2147483647, 618970019642690137449562111
Offset: 1
Examples
a(3) = 131071 because the (2*3=6)th Mersenne prime is 131071.
Formula
a(n) = A000668(2*n).
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.