A143771 - cp's OEIS frontend

A143771 a(n) = gcd(k + n/k), where k is over all divisors of n.

n	a(n)
1	2
2	3
3	4
4	1
5	6
6	1
7	8
8	3
9	2
10	1
11	12
12	1
13	14
14	3
15	8
16	1
17	18
18	1
19	20
20	3
21	2
22	1
23	24
24	1
25	2
26	3
27	4
28	1
29	30
30	1
31	32
32	3
33	2
34	1
35	12
36	1
37	38
38	3
39	8
40	1
41	42
42	1
43	44
44	3
45	2
46	1
47	48
48	1
49	2
50	3
51	4
52	1
53	54
54	1
55	8
56	3
57	2
58	1
59	60
60	1
61	62
62	3
63	8
64	1
65	6
66	1
67	68
68	3
69	2
70	1
71	72
72	1
73	74
74	3
75	4
76	1
77	6
78	1
79	80
80	3
81	2
82	1
83	84
84	1
85	2
86	3
87	8
88	1
89	90
90	1
91	4
92	3
93	2
94	1
95	24
96	1

[2, 3, 4, 1, 6, 1, 8, 3, 2, 1, 12, 1, 14, 3, 8, 1, 18, 1, 20, 3, 2, 1, 24, 1, 2, 3, 4, 1, 30, 1, 32, 3, 2, 1, 12, 1, 38, 3, 8, 1, 42, 1, 44, 3, 2, 1, 48, 1, 2, 3, 4, 1, 54, 1, 8, 3, 2, 1, 60, 1, 62, 3, 8, 1, 6, 1, 68, 3, 2, 1, 72, 1, 74, 3, 4, 1, 6, 1, 80, 3, 2, 1, 84, 1, 2, 3, 8, 1, 90, 1, 4, 3, 2, 1, 24, 1]

cp's OEIS Frontend

A143771 a(n) = gcd(k + n/k), where k is over all divisors of n.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	1
5	6
6	1
7	8
8	3
9	2
10	1
11	12
12	1
13	14
14	3
15	8
16	1
17	18
18	1
19	20
20	3
21	2
22	1
23	24
24	1
25	2
26	3
27	4
28	1
29	30
30	1
31	32
32	3
33	2
34	1
35	12
36	1
37	38
38	3
39	8
40	1
41	42
42	1
43	44
44	3
45	2
46	1
47	48
48	1
49	2
50	3
51	4
52	1
53	54
54	1
55	8
56	3
57	2
58	1
59	60
60	1
61	62
62	3
63	8
64	1
65	6
66	1
67	68
68	3
69	2
70	1
71	72
72	1
73	74
74	3
75	4
76	1
77	6
78	1
79	80
80	3
81	2
82	1
83	84
84	1
85	2
86	3
87	8
88	1
89	90
90	1
91	4
92	3
93	2
94	1
95	24
96	1

n	a(n)
1	2
2	3
3	4
4	1
5	6
6	1
7	8
8	3
9	2
10	1
11	12
12	1
13	14
14	3
15	8
16	1
17	18
18	1
19	20
20	3
21	2
22	1
23	24
24	1
25	2
26	3
27	4
28	1
29	30
30	1
31	32
32	3
33	2
34	1
35	12
36	1
37	38
38	3
39	8
40	1
41	42
42	1
43	44
44	3
45	2
46	1
47	48
48	1
49	2
50	3
51	4
52	1
53	54
54	1
55	8
56	3
57	2
58	1
59	60
60	1
61	62
62	3
63	8
64	1
65	6
66	1
67	68
68	3
69	2
70	1
71	72
72	1
73	74
74	3
75	4
76	1
77	6
78	1
79	80
80	3
81	2
82	1
83	84
84	1
85	2
86	3
87	8
88	1
89	90
90	1
91	4
92	3
93	2
94	1
95	24
96	1

n	a(n)
1	2
2	3
3	4
4	1
5	6
6	1
7	8
8	3
9	2
10	1
11	12
12	1
13	14
14	3
15	8
16	1
17	18
18	1
19	20
20	3
21	2
22	1
23	24
24	1
25	2
26	3
27	4
28	1
29	30
30	1
31	32
32	3
33	2
34	1
35	12
36	1
37	38
38	3
39	8
40	1
41	42
42	1
43	44
44	3
45	2
46	1
47	48
48	1
49	2
50	3
51	4
52	1
53	54
54	1
55	8
56	3
57	2
58	1
59	60
60	1
61	62
62	3
63	8
64	1
65	6
66	1
67	68
68	3
69	2
70	1
71	72
72	1
73	74
74	3
75	4
76	1
77	6
78	1
79	80
80	3
81	2
82	1
83	84
84	1
85	2
86	3
87	8
88	1
89	90
90	1
91	4
92	3
93	2
94	1
95	24
96	1