Numbers k such that 71*2^k+1 is prime.

Terms

a(0) =3a(1) =5a(2) =9a(3) =19a(4) =23a(5) =27a(6) =57a(7) =59a(8) =65a(9) =119a(10) =299a(11) =417a(12) =705a(13) =2255a(14) =4017a(15) =5193a(16) =5565a(17) =8055a(18) =17659a(19) =18039a(20) =19819a(21) =20507a(22) =21333a(23) =23289a(24) =103155a(25) =115913a(26) =145423a(27) =148419a(28) =204807a(29) =228879