Numbers n such that T(n) + T(n+1) + ... + T(n+21) is a square, where T(m) = A000217(m) is the m-th triangular number.

A254443

Numbers n such that T(n) + T(n+1) + ... + T(n+21) is a square, where T(m) = A000217(m) is the m-th triangular number.

Terms

    a(0) =35a(1) =75a(2) =911a(3) =1707a(4) =18383a(5) =34263a(6) =366947a(7) =683751a(8) =7320755a(9) =13640955a(10) =146048351a(11) =272135547a(12) =2913646463a(13) =5429070183a(14) =58126881107a(15) =108309268311

External references