A062828 - cp's OEIS frontend

A062828 a(n) = gcd(2n, n(n+1)/2).

n	a(n)
1	1
2	1
3	6
4	2
5	5
6	3
7	14
8	4
9	9
10	5
11	22
12	6
13	13
14	7
15	30
16	8
17	17
18	9
19	38
20	10
21	21
22	11
23	46
24	12
25	25
26	13
27	54
28	14
29	29
30	15
31	62
32	16
33	33
34	17
35	70
36	18
37	37
38	19
39	78
40	20
41	41
42	21
43	86
44	22
45	45
46	23
47	94
48	24
49	49
50	25
51	102
52	26
53	53
54	27
55	110
56	28
57	57
58	29
59	118
60	30
61	61
62	31
63	126
64	32
65	65
66	33
67	134
68	34
69	69
70	35
71	142

[1, 1, 6, 2, 5, 3, 14, 4, 9, 5, 22, 6, 13, 7, 30, 8, 17, 9, 38, 10, 21, 11, 46, 12, 25, 13, 54, 14, 29, 15, 62, 16, 33, 17, 70, 18, 37, 19, 78, 20, 41, 21, 86, 22, 45, 23, 94, 24, 49, 25, 102, 26, 53, 27, 110, 28, 57, 29, 118, 30, 61, 31, 126, 32, 65, 33, 134, 34, 69, 35, 142]

cp's OEIS Frontend

A062828 a(n) = gcd(2n, n(n+1)/2).

Table of values

List of values

n	a(n)
1	1
2	1
3	6
4	2
5	5
6	3
7	14
8	4
9	9
10	5
11	22
12	6
13	13
14	7
15	30
16	8
17	17
18	9
19	38
20	10
21	21
22	11
23	46
24	12
25	25
26	13
27	54
28	14
29	29
30	15
31	62
32	16
33	33
34	17
35	70
36	18
37	37
38	19
39	78
40	20
41	41
42	21
43	86
44	22
45	45
46	23
47	94
48	24
49	49
50	25
51	102
52	26
53	53
54	27
55	110
56	28
57	57
58	29
59	118
60	30
61	61
62	31
63	126
64	32
65	65
66	33
67	134
68	34
69	69
70	35
71	142

n	a(n)
1	1
2	1
3	6
4	2
5	5
6	3
7	14
8	4
9	9
10	5
11	22
12	6
13	13
14	7
15	30
16	8
17	17
18	9
19	38
20	10
21	21
22	11
23	46
24	12
25	25
26	13
27	54
28	14
29	29
30	15
31	62
32	16
33	33
34	17
35	70
36	18
37	37
38	19
39	78
40	20
41	41
42	21
43	86
44	22
45	45
46	23
47	94
48	24
49	49
50	25
51	102
52	26
53	53
54	27
55	110
56	28
57	57
58	29
59	118
60	30
61	61
62	31
63	126
64	32
65	65
66	33
67	134
68	34
69	69
70	35
71	142

n	a(n)
1	1
2	1
3	6
4	2
5	5
6	3
7	14
8	4
9	9
10	5
11	22
12	6
13	13
14	7
15	30
16	8
17	17
18	9
19	38
20	10
21	21
22	11
23	46
24	12
25	25
26	13
27	54
28	14
29	29
30	15
31	62
32	16
33	33
34	17
35	70
36	18
37	37
38	19
39	78
40	20
41	41
42	21
43	86
44	22
45	45
46	23
47	94
48	24
49	49
50	25
51	102
52	26
53	53
54	27
55	110
56	28
57	57
58	29
59	118
60	30
61	61
62	31
63	126
64	32
65	65
66	33
67	134
68	34
69	69
70	35
71	142