A340087 - cp's OEIS frontend

A340087 a(n) = gcd(n-1, A091732(n)), where A091732 is an infinitary analog of Euler's phi function.

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

[1, 1, 2, 3, 4, 1, 6, 1, 8, 1, 10, 1, 12, 1, 2, 15, 16, 1, 18, 1, 4, 1, 22, 1, 24, 1, 2, 9, 28, 1, 30, 1, 4, 1, 2, 1, 36, 1, 2, 3, 40, 1, 42, 1, 4, 1, 46, 1, 48, 1, 2, 3, 52, 1, 2, 1, 4, 1, 58, 1, 60, 1, 2, 9, 16, 5, 66, 1, 4, 3, 70, 1, 72, 1, 2, 3, 4, 1, 78, 1, 80, 1, 82, 1, 4, 1, 2, 3, 88, 1, 18, 1, 4, 1, 2, 5, 96]

cp's OEIS Frontend

A340087 a(n) = gcd(n-1, A091732(n)), where A091732 is an infinitary analog of Euler's phi function.

Table of values

List of values

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

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

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