Nonprimes in the triangle A141020.

Terms

a(0) =1a(1) =4a(2) =8a(3) =16a(4) =32a(5) =33a(6) =63a(7) =124a(8) =136a(9) =244a(10) =276a(11) =480a(12) =560a(13) =561a(14) =944a(15) =1135a(16) =1140a(17) =1856a(18) =2298a(19) =2316a(20) =3649a(21) =4705a(22) =7174a(23) =9398a(24) =9558a(25) =9559a(26) =14104a(27) =18984a(28) =19415a(29) =27728