Numbers n such that there is no square n-gonal number greater than 1.

Terms

a(0) =10a(1) =20a(2) =52a(3) =164a(4) =340a(5) =580a(6) =884a(7) =1252a(8) =1684a(9) =2180a(10) =2740a(11) =4052a(12) =4804a(13) =5620a(14) =6500a(15) =7444a(16) =8452a(17) =9524a(18) =10660a(19) =11860a(20) =13124a(21) =14452a(22) =15844a(23) =17300a(24) =18820a(25) =20404a(26) =22052a(27) =25540a(28) =27380a(29) =29284