Class number of real quadratic field Q(sqrt f), where f is the n-th squarefree number A005117(n).

Terms

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