Triangular numbers k such that psi(k) is a square, where psi(k) is the Dedekind psi function (A001615).
A292064
Triangular numbers k such that psi(k) is a square, where psi(k) is the Dedekind psi function (A001615).
Terms
- a(0) =1a(1) =3a(2) =66a(3) =210a(4) =276a(5) =1128a(6) =2346a(7) =2556a(8) =4278a(9) =5778a(10) =7140a(11) =7750a(12) =7875a(13) =11781a(14) =13041a(15) =18336a(16) =22578a(17) =27966a(18) =28920a(19) =31878a(20) =32131a(21) =32640a(22) =35511a(23) =51681a(24) =70125a(25) =73536a(26) =79800a(27) =89676a(28) =93096a(29) =100128
External references
- oeis: A292064