Discriminants of imaginary quadratic fields with class number 21 (negated).

Terms

a(0) =431a(1) =503a(2) =743a(3) =863a(4) =1931a(5) =2503a(6) =2579a(7) =2767a(8) =2819a(9) =3011a(10) =3371a(11) =4283a(12) =4523a(13) =4691a(14) =5011a(15) =5647a(16) =5851a(17) =5867a(18) =6323a(19) =6691a(20) =7907a(21) =8059a(22) =8123a(23) =8171a(24) =8243a(25) =8387a(26) =8627a(27) =8747a(28) =9091a(29) =9187