Triangular numbers composed of digits {1,6,9}.
A119144
Triangular numbers composed of digits {1,6,9}.
Terms
- a(0) =1a(1) =6a(2) =66a(3) =91a(4) =666a(5) =961191a(6) =996166a(7) =1191196a(8) =96111966961a(9) =99119996661
External references
- oeis: A119144