A120623 - cp's OEIS frontend

A120623 Numbers n such that the n-th Catalan number C(2n, n)/(n + 1) is divisible by n/3 but not divisible by n.

n	a(n)
1	3
2	12
3	18
4	84
5	99
6	120
7	198
8	216
9	273
10	342
11	432
12	522
13	540
14	792
15	828
16	945
17	975
18	984
19	990
20	1035
21	1071
22	1323
23	1377
24	1512
25	1548
26	1575
27	1710
28	1755
29	1863
30	2052
31	2106
32	2226
33	2385
34	2442
35	2790
36	2928
37	3009
38	3015
39	3132
40	3198
41	3483
42	3672
43	3807
44	3915
45	3996
46	4212
47	4428

[3, 12, 18, 84, 99, 120, 198, 216, 273, 342, 432, 522, 540, 792, 828, 945, 975, 984, 990, 1035, 1071, 1323, 1377, 1512, 1548, 1575, 1710, 1755, 1863, 2052, 2106, 2226, 2385, 2442, 2790, 2928, 3009, 3015, 3132, 3198, 3483, 3672, 3807, 3915, 3996, 4212, 4428]

cp's OEIS Frontend

A120623 Numbers n such that the n-th Catalan number C(2n, n)/(n + 1) is divisible by n/3 but not divisible by n.

Table of values

List of values