Numbers n such that 23*2^n-1 is prime.

Terms

a(0) =4a(1) =6a(2) =12a(3) =46a(4) =72a(5) =244a(6) =264a(7) =544a(8) =888a(9) =1146a(10) =14826a(11) =24978a(12) =103386a(13) =323668a(14) =458362a(15) =496422