A286451 - cp's OEIS frontend

A286451 Compound filter (2-adic valuation of sigma(n) & 2-adic valuation of n): a(n) = P(A286357(n), A001511(n)), where P(n,k) is sequence A000027 used as a pairing function, with a(1) = 0 by an explicit convention.

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

[0, 2, 6, 4, 3, 9, 10, 7, 1, 5, 6, 13, 3, 14, 10, 11, 3, 2, 6, 8, 21, 9, 10, 18, 1, 5, 10, 19, 3, 14, 21, 16, 15, 5, 15, 4, 3, 9, 10, 12, 3, 27, 6, 13, 3, 14, 15, 24, 1, 2, 10, 8, 3, 14, 10, 25, 15, 5, 6, 19, 3, 27, 10, 22, 6, 20, 6, 8, 21, 20, 10, 7, 3, 5, 6, 13, 21, 14, 15, 17, 1, 5, 6, 34, 6, 9, 10, 18, 3, 5, 15, 19, 36, 20, 10, 31, 3, 2, 6, 4, 3, 14, 10]

cp's OEIS Frontend

A286451 Compound filter (2-adic valuation of sigma(n) & 2-adic valuation of n): a(n) = P(A286357(n), A001511(n)), where P(n,k) is sequence A000027 used as a pairing function, with a(1) = 0 by an explicit convention.

Table of values

List of values

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

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

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