A341523 - cp's OEIS frontend

A341523 Number of prime factors (with multiplicity) shared by n and sigma(n): a(n) = bigomega(gcd(n, sigma(n))).

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	2
7	0
8	0
9	0
10	1
11	0
12	2
13	0
14	1
15	1
16	0
17	0
18	1
19	0
20	1
21	0
22	1
23	0
24	3
25	0
26	1
27	0
28	3
29	0
30	2
31	0
32	0
33	1
34	1
35	0
36	0
37	0
38	1
39	0
40	2
41	0
42	2
43	0
44	2
45	1
46	1
47	0
48	2
49	0
50	0
51	1
52	1
53	0
54	2
55	0
56	3
57	0
58	1
59	0
60	3
61	0
62	1
63	0
64	0
65	0
66	2
67	0
68	1
69	1
70	1
71	0
72	1
73	0
74	1
75	0
76	2
77	0
78	2
79	0
80	1
81	0
82	1
83	0
84	3
85	0
86	1
87	1
88	2
89	0
90	3
91	1
92	2
93	0
94	1
95	1
96	3
97	0
98	0
99	1
100	0
101	0
102	2
103	0
104	1
105	1

[0, 0, 0, 0, 0, 2, 0, 0, 0, 1, 0, 2, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 3, 0, 1, 0, 3, 0, 2, 0, 0, 1, 1, 0, 0, 0, 1, 0, 2, 0, 2, 0, 2, 1, 1, 0, 2, 0, 0, 1, 1, 0, 2, 0, 3, 0, 1, 0, 3, 0, 1, 0, 0, 0, 2, 0, 1, 1, 1, 0, 1, 0, 1, 0, 2, 0, 2, 0, 1, 0, 1, 0, 3, 0, 1, 1, 2, 0, 3, 1, 2, 0, 1, 1, 3, 0, 0, 1, 0, 0, 2, 0, 1, 1]

cp's OEIS Frontend

A341523 Number of prime factors (with multiplicity) shared by n and sigma(n): a(n) = bigomega(gcd(n, sigma(n))).

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	2
7	0
8	0
9	0
10	1
11	0
12	2
13	0
14	1
15	1
16	0
17	0
18	1
19	0
20	1
21	0
22	1
23	0
24	3
25	0
26	1
27	0
28	3
29	0
30	2
31	0
32	0
33	1
34	1
35	0
36	0
37	0
38	1
39	0
40	2
41	0
42	2
43	0
44	2
45	1
46	1
47	0
48	2
49	0
50	0
51	1
52	1
53	0
54	2
55	0
56	3
57	0
58	1
59	0
60	3
61	0
62	1
63	0
64	0
65	0
66	2
67	0
68	1
69	1
70	1
71	0
72	1
73	0
74	1
75	0
76	2
77	0
78	2
79	0
80	1
81	0
82	1
83	0
84	3
85	0
86	1
87	1
88	2
89	0
90	3
91	1
92	2
93	0
94	1
95	1
96	3
97	0
98	0
99	1
100	0
101	0
102	2
103	0
104	1
105	1

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	2
7	0
8	0
9	0
10	1
11	0
12	2
13	0
14	1
15	1
16	0
17	0
18	1
19	0
20	1
21	0
22	1
23	0
24	3
25	0
26	1
27	0
28	3
29	0
30	2
31	0
32	0
33	1
34	1
35	0
36	0
37	0
38	1
39	0
40	2
41	0
42	2
43	0
44	2
45	1
46	1
47	0
48	2
49	0
50	0
51	1
52	1
53	0
54	2
55	0
56	3
57	0
58	1
59	0
60	3
61	0
62	1
63	0
64	0
65	0
66	2
67	0
68	1
69	1
70	1
71	0
72	1
73	0
74	1
75	0
76	2
77	0
78	2
79	0
80	1
81	0
82	1
83	0
84	3
85	0
86	1
87	1
88	2
89	0
90	3
91	1
92	2
93	0
94	1
95	1
96	3
97	0
98	0
99	1
100	0
101	0
102	2
103	0
104	1
105	1

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	2
7	0
8	0
9	0
10	1
11	0
12	2
13	0
14	1
15	1
16	0
17	0
18	1
19	0
20	1
21	0
22	1
23	0
24	3
25	0
26	1
27	0
28	3
29	0
30	2
31	0
32	0
33	1
34	1
35	0
36	0
37	0
38	1
39	0
40	2
41	0
42	2
43	0
44	2
45	1
46	1
47	0
48	2
49	0
50	0
51	1
52	1
53	0
54	2
55	0
56	3
57	0
58	1
59	0
60	3
61	0
62	1
63	0
64	0
65	0
66	2
67	0
68	1
69	1
70	1
71	0
72	1
73	0
74	1
75	0
76	2
77	0
78	2
79	0
80	1
81	0
82	1
83	0
84	3
85	0
86	1
87	1
88	2
89	0
90	3
91	1
92	2
93	0
94	1
95	1
96	3
97	0
98	0
99	1
100	0
101	0
102	2
103	0
104	1
105	1