Class numbers h(-p) where p runs through the primes p == 3 (mod 4).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =3a(6) =1a(7) =5a(8) =3a(9) =1a(10) =7a(11) =5a(12) =3a(13) =5a(14) =3a(15) =5a(16) =5a(17) =3a(18) =7a(19) =1a(20) =11a(21) =5a(22) =13a(23) =9a(24) =3a(25) =7a(26) =5a(27) =15a(28) =7a(29) =13