Primes of the form (3*x + 2)*2^x - 1.A229018Primes of the form (3*x + 2)*2^x - 1.Terms a(0) =31a(1) =223a(2) =1279a(3) =3276799a(4) =14680063a(5) =420906795007External referencesoeis: A229018