Numbers k such that 53*2^k+1 is prime.

Terms

a(0) =1a(1) =5a(2) =17a(3) =21a(4) =61a(5) =85a(6) =93a(7) =105a(8) =133a(9) =485a(10) =857a(11) =1665a(12) =2133a(13) =2765a(14) =5621a(15) =9025a(16) =12241a(17) =165541a(18) =181033a(19) =205301a(20) =341301a(21) =482377a(22) =816013a(23) =1066381a(24) =1541133a(25) =3709297a(26) =4197093a(27) =5019181