Triangular numbers all of whose digits are nonprimes.

Terms

a(0) =0a(1) =1a(2) =6a(3) =10a(4) =66a(5) =91a(6) =190a(7) =406a(8) =496a(9) =666a(10) =861a(11) =946a(12) =990a(13) =1081a(14) =1891a(15) =4186a(16) =6441a(17) =8001a(18) =8646a(19) =8911a(20) =9180a(21) =10011a(22) =10440a(23) =14196a(24) =16110a(25) =19110a(26) =19900a(27) =40186a(28) =41041a(29) =41616