Primes of the form 2^r*11^s + 1.

Terms

a(0) =2a(1) =3a(2) =5a(3) =17a(4) =23a(5) =89a(6) =257a(7) =353a(8) =1409a(9) =2663a(10) =30977a(11) =65537a(12) =170369a(13) =495617a(14) =5767169a(15) =23068673a(16) =59969537a(17) =82458113a(18) =453519617a(19) =3429742097a(20) =4715895383a(21) =15352201217a(22) =39909726209