Numbers n such that T(n) + T(n+1) + ... + T(n+26) is a square, where T = A000217 (triangular numbers).

A257709

Numbers n such that T(n) + T(n+1) + ... + T(n+26) is a square, where T = A000217 (triangular numbers).

Terms

    a(0) =8a(1) =14a(2) =39a(3) =53a(4) =103a(5) =112a(6) =206a(7) =264a(8) =509a(9) =647a(10) =1141a(11) =1230a(12) =2160a(13) =2734a(14) =5159a(15) =6525a(16) =11415a(17) =12296a(18) =21502a(19) =27184a(20) =51189a(21) =64711a(22) =113117a(23) =121838a(24) =212968a(25) =269214a(26) =506839a(27) =640693a(28) =1119863a(29) =1206192

External references