Chacon sequences: A049320 *, A049321 *
Chains:: A007047 , A005603 , A005602
challenge problems, see sequences that need extending
Champernowne constant: A033307 *, A030167 *, A058068 , A058069 , A007376
Champernowne sequence: A030190 *, A030302
change ringing: see bell ringing
characters of groups: A005368
characters, see also under symmetric group
Chebycheff is spelled Chebyshev throughout
Chebychev is spelled Chebyshev throughout
Chebyshev polynomials , sequences related to (start):
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 1): A001792 A001793 A001794 A002698 A005583 A005584 A006974 A006975 A006976 A007701 A008310 A008311
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 2): A020537 A020538 A020539 A039991 A053120 A001105 A002415 A002492 A005585 A040977 A050486 A008314
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 3): A053347 A054322 A054323 A054324 A054325 A054326 A054327 A054328 A054329 A054330 A054331 A054332
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 4): A054333 A054334 A001653 A070997 A001091 A072256 A001075 A001541 A005248 A003501 A056854 A056918
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 5): A057076 A001079 A023038 A011943 A023039 A001081 A001085 A077235 A077236 A077237 A077238 A077239
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 6): A077240 A077242 A077244 A077246 A077248 A077250 A077409 A077411 A001570 A001835 A056771 A077417
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 7): A077420 A077422 A077424 A077428 A078356 A078363 A078365 A078367 A078369 A000129 A001333 A001076
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 8): A001077 A005667 A005668 A041025 A078986
Chebyshev polynomials of the first kind (T- or C- polynomials) ( 9): A090733 A090248 A090251 A001519 A097308 -A097316 A097725 -A097742 A097765 -A097784 A097826 -A097835
Chebyshev polynomials of the first kind (T- or C- polynomials) (10): A090729 A090731 A097837 A097838 A097840 -A097845 A098244 A098246 A098247
Chebyshev polynomials of the first kind (T- or C- polynomials) (11): A098249 A098250 A098252 A098253 A098255 A098256 A098258 A098259 A098261 A098262 A098291 A098292 A078070 A004146 A007877 A054493 A011655 A011655 A049683
Chebyshev polynomials of the first kind (T- or C- polynomials) (12): A098249 A049684 A095004 A098296 -A098299 A098300 -A098310 A005386 A092936 A099270 -A099273 A099275 -A099279 A099365 -A099374 A099368 A099397 A001108 A007598 A079291
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 1): A001787 A001788 A001789 A002605 A003472 A008312 A008313 A008315 A010892 A020540 A020541 A020542
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 2): A030195 A030191 A030221 A030192 A030240 A049310 A049347 A053117 A053118 A053119 A053121 A002700
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 3): A053122 A051323 A053124 A053125 A053126 A053127 A053128 A053129 A053130 A053131 A001653 A001109
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 4): A054450 A001090 A001353 A018913 A004187 A004254 A004189 A001834 A002878 A002315 A056594
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 5): A057076 A057077 A057078 A057079 A057080 A057081 A001906 A056854 A056918
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 6): A057083 A057084 A057085 A057086 A057087 A057088 A057089 A057090 A057091 A057092 A057093 A057094
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 7): A025170 A025171 A004190 A001653 A070997 A001091 A072256 A054320 A004189 A001075 A005248 A003501
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 8): A054491 A054488 A023038 A004191 A007655 A011943 A049660 A023039 A001081 A001085 A075843 A077234
Chebyshev polynomials of the second kind (U- or S- polynomials) ( 9): A077237 A077413 A077241 A077243 A077245 A077247 A077249 A077251 A077410 A077412
Chebyshev polynomials of the second kind (U- or S- polynomials) (10): A028230 A001835 A029547 A046176 A029548 A077416 A077418 A077420 A077421 A077422 A077423
Chebyshev polynomials of the second kind (U- or S- polynomials) (11): A077424 A077428 A078356 A078362 A078363 A078364 A078365 A078366 A078367 A078368 A078369
Chebyshev polynomials of the second kind (U- or S- polynomials) (12): A000129 A001333 A001076 A001077 A005667 A005668 A041025 A078986 A078987
Chebyshev polynomials of the second kind (U- or S- polynomials) (13): A092499 A090733 A090248 A090251 A001519 A078922 A092521 A092420 A076765 A076139 A049664
Chebyshev polynomials of the second kind (U- or S- polynomials) (14): A097726 A097727 A097729 A097730 A097732 A097733 A097735 A097736 A097738 A097739 A097741 A097742 A097766 A097767 A097769 A097770
Chebyshev polynomials of the second kind (U- or S- polynomials) (15): A090729 A090731 A097834 -A097845 A098244 -A098263 A098291 A098292 A078070 A004146 A007877 A099368 A041041 A052918 A054413 A054493 A098301
Chebyshev polynomials: see also A002680
checkers: A055213 , A133046 , A133047
Chernoff sequence: A006939 *, A051357
chess, number of games , sequences related to (start):
chess, number of games , definition: position = position with castling and en passant information, diagram = position without castling and en passant information
chess, number of games: A048987 * A079485 A006494 A089956
chess, number of games: see also A007747 A007545 A007577
chess, number of diagrams: A019319 * A090051
chess, number of positions: A083276 * A057745 A089957
chessboard, halving a: A003155
chessboard, quartering a: A006067 , A003213
chord diagrams: (1) A007293 A007473 A007474 A007769 A014595 A018191 A018192 A018193 A018225 A022489 A022490 A022491 A022492
chord diagrams: (2) A022493 A022494 A054499 A054938
chords in a circle: A001006 , A054726 , A006533 , A000124
chords in a circle: see also Poonen-Rubinstein paper
Chowla sequence: see Mian-Chowla sequences
Chowla's function: sum of divisors excluding 1 and n: A048050 *, A002954
chromatic number of graphs: A006670 , A006671
chromatic number of surface: A000703 *, A000934 *, A059103
Chvatal conjecture: A007008
circle problem: A057655 *
circle product: A101330
circles, number of ways of arranging: A000081
circuits: A002631 , A002632