Numbers n such that T(n) + T(n+1) + ... + T(n+24) is a square, where T = A000217 (triangular numbers).

A257708

Numbers n such that T(n) + T(n+1) + ... + T(n+24) is a square, where T = A000217 (triangular numbers).

Terms

    a(0) =25a(1) =55a(2) =208a(3) =382a(4) =1273a(5) =2287a(6) =7480a(7) =13390a(8) =43657a(9) =78103a(10) =254512a(11) =455278a(12) =1483465a(13) =2653615a(14) =8646328a(15) =15466462a(16) =50394553a(17) =90145207a(18) =293721040a(19) =525404830a(20) =1711931737a(21) =3062283823a(22) =9977869432a(23) =17848298158a(24) =58155284905a(25) =104027505175a(26) =338953840048a(27) =606316732942

External references