Primes of the form 2^k + 11.A156940Primes of the form 2^k + 11.Terms a(0) =13a(1) =19a(2) =43a(3) =139a(4) =523a(5) =32779a(6) =8388619a(7) =536870923a(8) =2147483659External referencesoeis: A156940