Numbers k such that 27*T(k)+1 is a square, where T(m) is the m-th triangular number A000217(m).

A285984

Numbers k such that 27*T(k)+1 is a square, where T(m) is the m-th triangular number A000217(m).

Terms

    a(0) =0a(1) =110a(2) =374a(3) =107184a(4) =363264a(5) =103968854a(6) =352366190a(7) =100849681680a(8) =341794841520

External references