Triangular numbers T(k) that are three times another triangular number: T(k) such that T(k) = 3*T(m) for some m.

A076140

Triangular numbers T(k) that are three times another triangular number: T(k) such that T(k) = 3*T(m) for some m.

Terms

    a(0) =0a(1) =3a(2) =45a(3) =630a(4) =8778a(5) =122265a(6) =1702935a(7) =23718828a(8) =330360660a(9) =4601330415a(10) =64088265153a(11) =892634381730

External references