Numbers k such that 7*k^2 = floor(k*sqrt(7)*ceiling(k*sqrt(7))).

Terms

a(0) =1a(1) =3a(2) =17a(3) =48a(4) =271a(5) =765a(6) =4319a(7) =12192a(8) =68833a(9) =194307a(10) =1097009a(11) =3096720a(12) =17483311a(13) =49353213a(14) =278635967a(15) =786554688a(16) =4440692161a(17) =12535521795a(18) =70772438609a(19) =199781794032