Numbers k such that k^2 - 1 is a tetrahedral number (A000292).

A216269

Numbers k such that k^2 - 1 is a tetrahedral number (A000292).

Terms

    a(0) =1a(1) =6a(2) =11a(3) =45a(4) =51a(5) =209a(6) =660099

External references