A078896 - cp's OEIS frontend

A078896 Number of times the smallest prime factor of n is a factor in all numbers <= n; a(1) = 1.

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

[1, 1, 1, 3, 1, 4, 1, 7, 4, 8, 1, 10, 1, 11, 6, 15, 1, 16, 1, 18, 9, 19, 1, 22, 6, 23, 13, 25, 1, 26, 1, 31, 15, 32, 8, 34, 1, 35, 18, 38, 1, 39, 1, 41, 21, 42, 1, 46, 8, 47, 23, 49, 1, 50, 13, 53, 27, 54, 1, 56, 1, 57, 30, 63, 15, 64, 1, 66, 32, 67, 1, 70, 1, 71, 35, 73, 12, 74, 1, 78, 40]

cp's OEIS Frontend

A078896 Number of times the smallest prime factor of n is a factor in all numbers <= n; a(1) = 1.

Table of values

List of values

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

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

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