A161888 - cp's OEIS frontend

A161888 a(n) = the smallest positive integer that does not divide n, and is such that sum{k=1 to n} a(k) is coprime to n.

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

[2, 3, 2, 6, 3, 7, 2, 6, 4, 4, 2, 8, 2, 4, 4, 6, 2, 4, 2, 6, 4, 4, 2, 14, 3, 3, 4, 8, 2, 4, 2, 6, 2, 4, 2, 8, 2, 4, 4, 6, 2, 4, 2, 6, 6, 4, 2, 10, 2, 4, 2, 6, 2, 4, 3, 3, 4, 4, 2, 8, 2, 4, 4, 6, 3, 5, 2, 6, 2, 8, 2, 10, 2, 4, 4, 6, 3, 9, 2, 6, 4, 4, 2, 8, 3, 3, 4, 6, 2, 4, 2, 6, 4, 4, 3, 5, 2, 4, 2, 8, 2, 8, 2, 6, 2]

cp's OEIS Frontend

A161888 a(n) = the smallest positive integer that does not divide n, and is such that sum{k=1 to n} a(k) is coprime to n.

Table of values

List of values

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

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

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