A305985 - cp's OEIS frontend

A305985 Filter sequence combining from all divisors d > 1 of n, the prime signature of 2d+1.

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

[1, 2, 2, 3, 2, 4, 5, 6, 7, 8, 2, 9, 10, 8, 4, 11, 5, 12, 5, 13, 8, 14, 2, 15, 16, 17, 8, 18, 2, 19, 20, 18, 4, 21, 8, 22, 20, 21, 17, 23, 2, 24, 5, 25, 26, 8, 5, 27, 28, 29, 8, 30, 2, 19, 8, 31, 21, 14, 5, 32, 5, 33, 26, 34, 17, 35, 36, 18, 4, 37, 5, 32, 20, 14, 26, 38, 21, 39, 5, 40, 41, 42, 2, 43, 44, 8, 14, 45, 2, 46, 47, 18, 44, 48, 8, 49, 50, 51, 12, 52, 5]

cp's OEIS Frontend

A305985 Filter sequence combining from all divisors d > 1 of n, the prime signature of 2d+1.

Table of values

List of values

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

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

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