A305978 - cp's OEIS frontend

A305978 Filter sequence combining prime signatures of n and 2n+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	4
15	4
16	11
17	5
18	12
19	5
20	12
21	4
22	13
23	2
24	14
25	15
26	4
27	16
28	17
29	2
30	18
31	19
32	20
33	4
34	8
35	4
36	21
37	19
38	8
39	4
40	22
41	2
42	23
43	5
44	12
45	17
46	8
47	5
48	24
49	25
50	12
51	4
52	26
53	2
54	27
55	8
56	27
57	8
58	13
59	5
60	28
61	5
62	29
63	12
64	30
65	4
66	23
67	31
68	12
69	4
70	23
71	5
72	32
73	19
74	4
75	12
76	33
77	8
78	18
79	5
80	34
81	35
82	36
83	2
84	28
85	13
86	4
87	13
88	37
89	2
90	38
91	8
92	17
93	8
94	39
95	4
96	40
97	41
98	12
99	12
100	42
101	5
102	23

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

cp's OEIS Frontend

A305978 Filter sequence combining prime signatures of n and 2n+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	4
15	4
16	11
17	5
18	12
19	5
20	12
21	4
22	13
23	2
24	14
25	15
26	4
27	16
28	17
29	2
30	18
31	19
32	20
33	4
34	8
35	4
36	21
37	19
38	8
39	4
40	22
41	2
42	23
43	5
44	12
45	17
46	8
47	5
48	24
49	25
50	12
51	4
52	26
53	2
54	27
55	8
56	27
57	8
58	13
59	5
60	28
61	5
62	29
63	12
64	30
65	4
66	23
67	31
68	12
69	4
70	23
71	5
72	32
73	19
74	4
75	12
76	33
77	8
78	18
79	5
80	34
81	35
82	36
83	2
84	28
85	13
86	4
87	13
88	37
89	2
90	38
91	8
92	17
93	8
94	39
95	4
96	40
97	41
98	12
99	12
100	42
101	5
102	23

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

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