A340148 - cp's OEIS frontend

A340148 a(n) = Product_{distinct primes p dividing n} gcd(q-1, A003961(n)-1), where q = A151800(p), the next prime larger than p.

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

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

cp's OEIS Frontend

A340148 a(n) = Product_{distinct primes p dividing n} gcd(q-1, A003961(n)-1), where q = A151800(p), the next prime larger than p.

Table of values

List of values

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

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

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