Q(sqrt(n)) has class number 4.

Terms

a(0) =82a(1) =130a(2) =145a(3) =170a(4) =195a(5) =210a(6) =219a(7) =231a(8) =255a(9) =274a(10) =290a(11) =291a(12) =322a(13) =323a(14) =330a(15) =370a(16) =390a(17) =410a(18) =434a(19) =435a(20) =438a(21) =445a(22) =455a(23) =462a(24) =483a(25) =505a(26) =510a(27) =514a(28) =530a(29) =546