A319338 - cp's OEIS frontend

A319338 Filter sequence combining the 2-adic valuation of n (A007814) with gcd(n,sigma(n)) (A009194).

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

[1, 2, 1, 3, 1, 4, 1, 5, 1, 6, 1, 7, 1, 6, 8, 9, 1, 10, 1, 11, 1, 6, 1, 12, 1, 6, 1, 13, 1, 4, 1, 14, 8, 6, 1, 3, 1, 6, 1, 15, 1, 4, 1, 7, 8, 6, 1, 16, 1, 2, 8, 11, 1, 4, 1, 17, 1, 6, 1, 18, 1, 6, 1, 19, 1, 4, 1, 11, 8, 6, 1, 20, 1, 6, 1, 7, 1, 4, 1, 21, 1, 6, 1, 13, 1, 6, 8, 22, 1, 23, 24, 7, 1, 6, 25, 26, 1, 2, 8, 3, 1, 4, 1, 27, 8]

cp's OEIS Frontend

A319338 Filter sequence combining the 2-adic valuation of n (A007814) with gcd(n,sigma(n)) (A009194).

Table of values

List of values

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

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

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