Composite numbers k such that binomial(4*k, k) == 4^k (mod k).

Terms

a(0) =4a(1) =6a(2) =18a(3) =30a(4) =39a(5) =54a(6) =56a(7) =68a(8) =84a(9) =92a(10) =184a(11) =208a(12) =992a(13) =2704a(14) =16256a(15) =27424a(16) =52064a(17) =129848a(18) =225229a(19) =514688a(20) =616688a(21) =1194649a(22) =1818176a(23) =3788416a(24) =12327121a(25) =53703248a(26) =67100672a(27) =2160093568a(28) =2779417328a(29) =3899921104