A014847 - cp's OEIS frontend

A014847 Numbers k such that k-th Catalan number C(2k,k)/(k+1) is divisible by k.

n	a(n)
1	1
2	2
3	6
4	15
5	20
6	28
7	42
8	45
9	66
10	77
11	88
12	91
13	104
14	110
15	126
16	140
17	153
18	156
19	170
20	187
21	190
22	204
23	209
24	210
25	220
26	228
27	231
28	238
29	240
30	266
31	276
32	299
33	308
34	312
35	315
36	322
37	325
38	330
39	345
40	368
41	378
42	414
43	420
44	429
45	435
46	440
47	442
48	450
49	459
50	460
51	464
52	468
53	476
54	483
55	493

[1, 2, 6, 15, 20, 28, 42, 45, 66, 77, 88, 91, 104, 110, 126, 140, 153, 156, 170, 187, 190, 204, 209, 210, 220, 228, 231, 238, 240, 266, 276, 299, 308, 312, 315, 322, 325, 330, 345, 368, 378, 414, 420, 429, 435, 440, 442, 450, 459, 460, 464, 468, 476, 483, 493]

cp's OEIS Frontend

A014847 Numbers k such that k-th Catalan number C(2k,k)/(k+1) is divisible by k.

Table of values

List of values

n	a(n)
1	1
2	2
3	6
4	15
5	20
6	28
7	42
8	45
9	66
10	77
11	88
12	91
13	104
14	110
15	126
16	140
17	153
18	156
19	170
20	187
21	190
22	204
23	209
24	210
25	220
26	228
27	231
28	238
29	240
30	266
31	276
32	299
33	308
34	312
35	315
36	322
37	325
38	330
39	345
40	368
41	378
42	414
43	420
44	429
45	435
46	440
47	442
48	450
49	459
50	460
51	464
52	468
53	476
54	483
55	493

n	a(n)
1	1
2	2
3	6
4	15
5	20
6	28
7	42
8	45
9	66
10	77
11	88
12	91
13	104
14	110
15	126
16	140
17	153
18	156
19	170
20	187
21	190
22	204
23	209
24	210
25	220
26	228
27	231
28	238
29	240
30	266
31	276
32	299
33	308
34	312
35	315
36	322
37	325
38	330
39	345
40	368
41	378
42	414
43	420
44	429
45	435
46	440
47	442
48	450
49	459
50	460
51	464
52	468
53	476
54	483
55	493

n	a(n)
1	1
2	2
3	6
4	15
5	20
6	28
7	42
8	45
9	66
10	77
11	88
12	91
13	104
14	110
15	126
16	140
17	153
18	156
19	170
20	187
21	190
22	204
23	209
24	210
25	220
26	228
27	231
28	238
29	240
30	266
31	276
32	299
33	308
34	312
35	315
36	322
37	325
38	330
39	345
40	368
41	378
42	414
43	420
44	429
45	435
46	440
47	442
48	450
49	459
50	460
51	464
52	468
53	476
54	483
55	493