A318888 - cp's OEIS frontend

A318888 Filter sequence combining the 2-adic valuation of n (A007814) with the differences between odd primes in the prime factorization of n.

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

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

cp's OEIS Frontend

A318888 Filter sequence combining the 2-adic valuation of n (A007814) with the differences between odd primes in the prime factorization of n.

Table of values

List of values

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

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

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