Numbers k > 0 such that k^2 is a centered triangular number.

Terms

a(0) =1a(1) =2a(2) =8a(3) =19a(4) =79a(5) =188a(6) =782a(7) =1861a(8) =7741a(9) =18422a(10) =76628a(11) =182359a(12) =758539a(13) =1805168a(14) =7508762a(15) =17869321a(16) =74329081a(17) =176888042a(18) =735782048a(19) =1751011099a(20) =7283491399a(21) =17333222948a(22) =72099131942a(23) =171581218381a(24) =713707828021