First member of the Diophantine pair (m,k) that satisfies 7*(m^2+m) = k^2+k; a(n)=m.

A077398

First member of the Diophantine pair (m,k) that satisfies 7*(m^2+m) = k^2+k; a(n)=m.

Terms

    a(0) =0a(1) =2a(2) =5a(3) =39a(4) =87a(5) =629a(6) =1394a(7) =10032a(8) =22224a(9) =159890a(10) =354197a(11) =2548215a(12) =5644935a(13) =40611557a(14) =89964770a(15) =647236704a(16) =1433791392a(17) =10315175714a(18) =22850697509a(19) =164395574727a(20) =364177368759

External references