cycle index in Maple: see A036658 ;
cycle index of representations of groups: A000292 (D_6); A002817 (D_8); A006008 (A_4); A000389 , A063843 (S_5); A000543 , A047780 , A060530 (group of cube)
cycle index of symmetric group S_n for n = 1..27 in Maple: see link in A000142 ;
Cycles in x -> x^2 mod n: A023153
cyclic group: see group, cyclic
cyclic numbers: A003277 *, A001914 , A001913
Cyclic:: A002885 , A007039 , A006205 , A007040 , A006609 , A002956 , A005666 , A006204 , A007687 , A007688 , A005665 , A000804 , A000805
cyclotomic cosets: A064285 , A064286 , A064287
cyclotomic fields, class numbers of: A000927 (first factor h-), A055513 (class number h), A061653 , A035115
cyclotomic fields, with class number 1: A005848
cyclotomic polynomials, largest coefficient of: A013594 *, A046887
cyclotomic polynomials, positions of coefficients, sequences related to (start):
cyclotomic polynomials, positions of coefficients: A063696 , A063697 , A063698 , A063699 , A063670 , A063671
cyclotomic polynomials, triangle of coefficients of: A013595 *, A013596 *
cyclotomic polynomials, values at phi , sequences related to (start):
cyclotomic polynomials, values at phi = (sqrt(5)+1)/2: A063703 , A063705 , A063707
cyclotomic polynomials, values at x = integers, sequences related to (start):
cyclotomic polynomials, values at x = -1 to -13: A020513 , A020501 , A020502 , A020503 , A020504 , A020505 , A020506 , A020507 , A020508 , A020509 , A020510 , A020511 , A020512
cyclotomic polynomials, values at x = 1 to 13: A020500 , A019320 , A019321 , A019322 , A019323 , A019324 , A019325 , A019326 , A019327 , A019328 , A019329 , A019330 , A019331
cyclotomic polynomials, values of (1): A000027 A002061 A002522 A053699 A053716 A002523 A060883 A060884 A060885 A060886 A060887
cyclotomic polynomials, values of (2): A060888 A060889 A060890 A060891 A060892 A060893 A060894 A060895 A060896
cylinder, kings on a: A002493
C[n,k]: binomial coefficient n-choose-k (see A007318 )
C_n lattice: coordination sequence for: see A01000D.