Triangular numbers composed of digits {5,6,7}.
A119218
Triangular numbers composed of digits {5,6,7}.
Terms
- a(0) =6a(1) =55a(2) =66a(3) =666a(4) =5565a(5) =6555a(6) =5656566a(7) =5676765a(8) =6655776a(9) =56567566a(10) =575675766555a(11) =677767555675
External references
- oeis: A119218