class number of Q(sqrt -n), n squarefree: A000924 *
class numbers (1): A000003 , A001985 , A001987 , A001989 , A001991 , A002141 , A002143 , A003646 , A003647
class numbers (2): A003648 , A003649 , A003650 , A003651 , A003652 , A005472 , A005474 , A005847 , A005848 *, A006641
class numbers (3): A006642 , A006643 , A014599 , A014600 , A029702 , A039958
class numbers of fields: see also quadratic fields
class numbers of fields: see also cyclotomic fields
class numbers of imaginary quadratic fields, see quadratic fields, imaginary
class numbers of imaginary quadratic fields: see also A081319 A060649 A038552 A046125
class numbers, of fields (1):: A003652 , A003649 , A003650 , A003651 , A003639 , A006642 , A003638 , A006643
class numbers, of fields (2):: A003636 , A003637 , A005472 , A001989 , A001987
Class numbers, of quadratic forms:: A003646 , A003647 , A006641 , A000003 , A003648
Class numbers:: A003173 , A002143 , A000233 , A005847 , A000362 , A002052 , A006203 , A000508
classifications of n things: A005646
Clifford group, sequences related to (start):
Clifford group, Molien series for: A008621 , A008718 , A024186 (real); A008620 , A028288 , A039946 , A051354 (complex)
Clifford group, orders of: A001309 * (real), A003956 * (complex)
Clifford group: see also A014115 , A014116 , A027633
cliques: A005289
clock sequences: A028354 , A028355 , A028356 , A068962 , A007980
closed under certain affine transformations: see Klarner-Rado sequences
closure systems: A047684
clouds: A001205 *
cluster series, (start):
Cluster series:: A003204 , A003199 , A003203 , A003212 , A003202 , A003198 , A003208 , A003211 , A003201 , A003210 , A003197 , A003207 , A003200 , A003209 , A003206 , A003205
Clusters:: A007174 , A007172 , A007175 , A007173