Triangular numbers that are 1/5 of a triangular number.
A077260
Triangular numbers that are 1/5 of a triangular number.
Terms
- a(0) =0a(1) =3a(2) =21a(3) =990a(4) =6786a(5) =318801a(6) =2185095a(7) =102652956a(8) =703593828a(9) =33053933055a(10) =226555027545
External references
- oeis: A077260