Index to OEIS (Section 3)
3-adic valuation: A007949
, A051064
3-almost primes: A014612
*, A072114
("pi"), A109251
3-colored: (1) A000685
A006201
A006964
A027710
A029857
A036252
A038050
A038059
A038060
A038061
A038062
A038076
3-colored: (2) A038079
A038080
A053762
3-connected: (1) A000109
A000944
A002880
A005644
A005645
A006290
A006445
A007083
A007084
A007085
A007100
A047051
3-connected: (2) A049337
A052444
3-connected: see also graphs, 3-connected
3-gonal numbers: see triangular numbers A000217
3-plexes: A003189
, A051240
3-polyhedra: A006868
3-smooth numbers: A003586
3-trees: A000672
A002658
A003035
A003611
A003612
A006894
A007135
A007136
A036362
3n - sigma(n): see under n -> 3n - sigma(n)
3x+1 problem , sequences related to (start):
3x+1 problem, (01): A000546
, A001281
, A005186
, A006370
* (image of n), A006460
, A006513
, A006577
* (steps to reach 1), A006666
, A006667
, A006877
, A006878
, A006884
3x+1 problem, (02): A006885
, A008873
, A008874
, A008875
, A008876
, A008877
, A008878
, A008879
, A008880
, A008882
, A008883
, A008884
3x+1 problem, (03): A008908
, A010120
, A016945
, A025586
, A025587
, A033478
, A033479
, A033480
, A033481
, A033491
, A033492
, A033493
3x+1 problem, (04): A033494
, A033495
, A033496
, A033958
, A033959
, A039508
, A045474
, A045475
, A045476
, A055509
, A055510
, A056959
3x+1 problem, (05): A060322
, A060409
, A060410
, A060411
, A060412
, A060413
, A060414
, A060415
, A060445
, A060565
, A061641
, A062052
3x+1 problem, (06): A062053
, A062054
, A062055
, A062056
, A062057
, A062058
, A062059
, A062060
, A064684
, A064685
, A066756
, A066773
3x+1 problem, (07): A066861
, A069206
, A069323
, A070165
, A070167
, A072761
, A075677
, A078719
, A078720
, A092892
, A092893
, A112695
3x+1 problem, (08): A116623
, A116640
, A116641
, A128333
, A133419
, A133420
, A133421
, A133422
, A133423
, A133424
, A133425
, A133426
3x+1 problem, (09): A135282
, A138750
, A138751
, A138752
, A138753
, A138754
, A138757
, A139391
, A139399
, A139435
, A139436
3x+1 problem, (10): A131450
3x+1 problem, J. C. Lagarias's 3x+1 Problem Annotated Bibliography
3^n: A000244
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