A118310 - cp's OEIS frontend

A118310 a(n) = gcd(n,m(n)), where m(n) is the n-th nonprime positive integer (1 or composite).

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

[1, 2, 3, 4, 1, 2, 1, 2, 3, 2, 1, 4, 1, 2, 3, 1, 1, 9, 1, 10, 1, 11, 1, 1, 1, 2, 3, 4, 1, 2, 1, 2, 3, 1, 5, 3, 1, 2, 1, 8, 1, 2, 1, 2, 9, 2, 1, 6, 1, 1, 1, 4, 1, 3, 1, 7, 3, 2, 1, 2, 1, 1, 1, 1, 1, 6, 1, 4, 3, 2, 1, 24, 1, 1, 25, 2, 1, 3, 1, 4, 1, 1, 1, 6, 5, 2, 3, 2, 1, 30, 1, 2, 3, 2, 5, 6, 1, 1, 1, 4, 1, 2, 1]

cp's OEIS Frontend

A118310 a(n) = gcd(n,m(n)), where m(n) is the n-th nonprime positive integer (1 or composite).

Table of values

List of values

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

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

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