Ulam numbers k such that 4*k and 16*k are also Ulam numbers.

Terms

a(0) =1a(1) =324a(2) =1296a(3) =1858a(4) =2630a(5) =2814a(6) =3451a(7) =4905a(8) =6366a(9) =7258a(10) =7322a(11) =8754a(12) =8966a(13) =9980a(14) =10655a(15) =10779a(16) =10909a(17) =11881a(18) =12248a(19) =13609a(20) =13917a(21) =14769a(22) =14904a(23) =16502a(24) =17281a(25) =17303a(26) =18923a(27) =18943a(28) =19598a(29) =19852