Triangular numbers k such that 2*k-1 is also a triangular number.

A097579

Triangular numbers k such that 2*k-1 is also a triangular number.

Terms

    a(0) =1a(1) =28a(2) =946a(3) =32131a(4) =1091503a(5) =37078966a(6) =1259593336a(7) =42789094453

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