Even numbers k such that 2^(2*k) == 2 (mod k).

Terms

a(0) =2a(1) =14a(2) =1022a(3) =20066a(4) =485918a(5) =2531678a(6) =3677198a(7) =8277458a(8) =8893262a(9) =21122318a(10) =26358638a(11) =39852014a(12) =42448478a(13) =76712318a(14) =131492498a(15) =144322478a(16) =164360606a(17) =175126478a(18) =176647378a(19) =196705598a(20) =249126626a(21) =306789074a(22) =317051378a(23) =438023138a(24) =497041538a(25) =696970718a(26) =996520658