A107756 - cp's OEIS frontend

A107756 Numbers k such that Sum_{j=1..k} Catalan(j) == 1 (mod 3).

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	10
7	13
8	14
9	15
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	23
18	24
19	25
20	28
21	31
22	32
23	33
24	34
25	37
26	40
27	41
28	42
29	43
30	44
31	45
32	46
33	47
34	48
35	49
36	50
37	51
38	52
39	53
40	54
41	55
42	56
43	57
44	58
45	59
46	60
47	61
48	62
49	63
50	64
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	75
62	76
63	77
64	78
65	79
66	82
67	85
68	86
69	87
70	88
71	91
72	94
73	95

[1, 4, 5, 6, 7, 10, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 28, 31, 32, 33, 34, 37, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 82, 85, 86, 87, 88, 91, 94, 95]

cp's OEIS Frontend

A107756 Numbers k such that Sum_{j=1..k} Catalan(j) == 1 (mod 3).

Table of values

List of values

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	10
7	13
8	14
9	15
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	23
18	24
19	25
20	28
21	31
22	32
23	33
24	34
25	37
26	40
27	41
28	42
29	43
30	44
31	45
32	46
33	47
34	48
35	49
36	50
37	51
38	52
39	53
40	54
41	55
42	56
43	57
44	58
45	59
46	60
47	61
48	62
49	63
50	64
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	75
62	76
63	77
64	78
65	79
66	82
67	85
68	86
69	87
70	88
71	91
72	94
73	95

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	10
7	13
8	14
9	15
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	23
18	24
19	25
20	28
21	31
22	32
23	33
24	34
25	37
26	40
27	41
28	42
29	43
30	44
31	45
32	46
33	47
34	48
35	49
36	50
37	51
38	52
39	53
40	54
41	55
42	56
43	57
44	58
45	59
46	60
47	61
48	62
49	63
50	64
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	75
62	76
63	77
64	78
65	79
66	82
67	85
68	86
69	87
70	88
71	91
72	94
73	95

n	a(n)
1	1
2	4
3	5
4	6
5	7
6	10
7	13
8	14
9	15
10	16
11	17
12	18
13	19
14	20
15	21
16	22
17	23
18	24
19	25
20	28
21	31
22	32
23	33
24	34
25	37
26	40
27	41
28	42
29	43
30	44
31	45
32	46
33	47
34	48
35	49
36	50
37	51
38	52
39	53
40	54
41	55
42	56
43	57
44	58
45	59
46	60
47	61
48	62
49	63
50	64
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	73
60	74
61	75
62	76
63	77
64	78
65	79
66	82
67	85
68	86
69	87
70	88
71	91
72	94
73	95