A143772 - cp's OEIS frontend

A143772 If m is the n-th composite, then a(n) = gcd(k + m/k), where k is over all divisors of m.

n	a(n)
1	1
2	1
3	3
4	2
5	1
6	1
7	3
8	8
9	1
10	1
11	3
12	2
13	1
14	1
15	2
16	3
17	4
18	1
19	1
20	3
21	2
22	1
23	12
24	1
25	3
26	8
27	1
28	1
29	3
30	2
31	1
32	1
33	2
34	3
35	4
36	1
37	1
38	8
39	3
40	2
41	1
42	1
43	3
44	8
45	1
46	6
47	1
48	3
49	2
50	1
51	1
52	3
53	4
54	1
55	6
56	1
57	3
58	2
59	1
60	1
61	2
62	3
63	8
64	1
65	1
66	4
67	3
68	2
69	1
70	24
71	1
72	3
73	4
74	1
75	1
76	3
77	2
78	1
79	1
80	3
81	8
82	1
83	1
84	4
85	3
86	2
87	1
88	24
89	1
90	2
91	3
92	4
93	1
94	6
95	1
96	3
97	2
98	1
99	1
100	2
101	3
102	8
103	1
104	1
105	3

[1, 1, 3, 2, 1, 1, 3, 8, 1, 1, 3, 2, 1, 1, 2, 3, 4, 1, 1, 3, 2, 1, 12, 1, 3, 8, 1, 1, 3, 2, 1, 1, 2, 3, 4, 1, 1, 8, 3, 2, 1, 1, 3, 8, 1, 6, 1, 3, 2, 1, 1, 3, 4, 1, 6, 1, 3, 2, 1, 1, 2, 3, 8, 1, 1, 4, 3, 2, 1, 24, 1, 3, 4, 1, 1, 3, 2, 1, 1, 3, 8, 1, 1, 4, 3, 2, 1, 24, 1, 2, 3, 4, 1, 6, 1, 3, 2, 1, 1, 2, 3, 8, 1, 1, 3]

cp's OEIS Frontend

A143772 If m is the n-th composite, then a(n) = gcd(k + m/k), where k is over all divisors of m.

Table of values

List of values

n	a(n)
1	1
2	1
3	3
4	2
5	1
6	1
7	3
8	8
9	1
10	1
11	3
12	2
13	1
14	1
15	2
16	3
17	4
18	1
19	1
20	3
21	2
22	1
23	12
24	1
25	3
26	8
27	1
28	1
29	3
30	2
31	1
32	1
33	2
34	3
35	4
36	1
37	1
38	8
39	3
40	2
41	1
42	1
43	3
44	8
45	1
46	6
47	1
48	3
49	2
50	1
51	1
52	3
53	4
54	1
55	6
56	1
57	3
58	2
59	1
60	1
61	2
62	3
63	8
64	1
65	1
66	4
67	3
68	2
69	1
70	24
71	1
72	3
73	4
74	1
75	1
76	3
77	2
78	1
79	1
80	3
81	8
82	1
83	1
84	4
85	3
86	2
87	1
88	24
89	1
90	2
91	3
92	4
93	1
94	6
95	1
96	3
97	2
98	1
99	1
100	2
101	3
102	8
103	1
104	1
105	3

n	a(n)
1	1
2	1
3	3
4	2
5	1
6	1
7	3
8	8
9	1
10	1
11	3
12	2
13	1
14	1
15	2
16	3
17	4
18	1
19	1
20	3
21	2
22	1
23	12
24	1
25	3
26	8
27	1
28	1
29	3
30	2
31	1
32	1
33	2
34	3
35	4
36	1
37	1
38	8
39	3
40	2
41	1
42	1
43	3
44	8
45	1
46	6
47	1
48	3
49	2
50	1
51	1
52	3
53	4
54	1
55	6
56	1
57	3
58	2
59	1
60	1
61	2
62	3
63	8
64	1
65	1
66	4
67	3
68	2
69	1
70	24
71	1
72	3
73	4
74	1
75	1
76	3
77	2
78	1
79	1
80	3
81	8
82	1
83	1
84	4
85	3
86	2
87	1
88	24
89	1
90	2
91	3
92	4
93	1
94	6
95	1
96	3
97	2
98	1
99	1
100	2
101	3
102	8
103	1
104	1
105	3

n	a(n)
1	1
2	1
3	3
4	2
5	1
6	1
7	3
8	8
9	1
10	1
11	3
12	2
13	1
14	1
15	2
16	3
17	4
18	1
19	1
20	3
21	2
22	1
23	12
24	1
25	3
26	8
27	1
28	1
29	3
30	2
31	1
32	1
33	2
34	3
35	4
36	1
37	1
38	8
39	3
40	2
41	1
42	1
43	3
44	8
45	1
46	6
47	1
48	3
49	2
50	1
51	1
52	3
53	4
54	1
55	6
56	1
57	3
58	2
59	1
60	1
61	2
62	3
63	8
64	1
65	1
66	4
67	3
68	2
69	1
70	24
71	1
72	3
73	4
74	1
75	1
76	3
77	2
78	1
79	1
80	3
81	8
82	1
83	1
84	4
85	3
86	2
87	1
88	24
89	1
90	2
91	3
92	4
93	1
94	6
95	1
96	3
97	2
98	1
99	1
100	2
101	3
102	8
103	1
104	1
105	3