Indices n such that A307672(2*n) = 4.

Terms

a(0) =10a(1) =17a(2) =28a(3) =30a(4) =31a(5) =37a(6) =44a(7) =50a(8) =51a(9) =53a(10) =64a(11) =71a(12) =82a(13) =84a(14) =85a(15) =88a(16) =90a(17) =92a(18) =93a(19) =94a(20) =100a(21) =109a(22) =111a(23) =112a(24) =118a(25) =125a(26) =131a(27) =132a(28) =134a(29) =143