Primes p such that p^2 divides 2^(2^(p-1)-1) - 1.

Terms

a(0) =7a(1) =73a(2) =127a(3) =337a(4) =487a(5) =601a(6) =881a(7) =937a(8) =1801a(9) =2593a(10) =2647a(11) =3079a(12) =3943a(13) =4057a(14) =4201a(15) =6553a(16) =7993a(17) =9199a(18) =10657a(19) =14407a(20) =15289a(21) =16759a(22) =18041a(23) =18121a(24) =20521a(25) =20809a(26) =21673a(27) =22111a(28) =24967a(29) =25111