A078897 - cp's OEIS frontend

A078897 Number of times the greatest 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	2
7	1
8	7
9	4
10	2
11	1
12	5
13	1
14	2
15	3
16	15
17	1
18	8
19	1
20	4
21	3
22	2
23	1
24	10
25	6
26	2
27	13
28	4
29	1
30	7
31	1
32	31
33	3
34	2
35	5
36	17
37	1
38	2
39	3
40	9
41	1
42	6
43	1
44	4
45	10
46	2
47	1
48	22
49	8
50	12
51	3
52	4
53	1
54	26
55	5
56	9
57	3
58	2
59	1
60	14
61	1
62	2
63	10
64	63
65	5
66	6
67	1
68	4
69	3
70	11
71	1
72	34
73	1
74	2
75	18
76	4
77	7
78	6
79	1
80	19
81	40
82	2
83	1
84	13
85	5
86	2
87	3
88	8
89	1
90	21
91	7
92	4
93	3
94	2
95	5

[1, 1, 1, 3, 1, 2, 1, 7, 4, 2, 1, 5, 1, 2, 3, 15, 1, 8, 1, 4, 3, 2, 1, 10, 6, 2, 13, 4, 1, 7, 1, 31, 3, 2, 5, 17, 1, 2, 3, 9, 1, 6, 1, 4, 10, 2, 1, 22, 8, 12, 3, 4, 1, 26, 5, 9, 3, 2, 1, 14, 1, 2, 10, 63, 5, 6, 1, 4, 3, 11, 1, 34, 1, 2, 18, 4, 7, 6, 1, 19, 40, 2, 1, 13, 5, 2, 3, 8, 1, 21, 7, 4, 3, 2, 5]

cp's OEIS Frontend

A078897 Number of times the greatest 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	2
7	1
8	7
9	4
10	2
11	1
12	5
13	1
14	2
15	3
16	15
17	1
18	8
19	1
20	4
21	3
22	2
23	1
24	10
25	6
26	2
27	13
28	4
29	1
30	7
31	1
32	31
33	3
34	2
35	5
36	17
37	1
38	2
39	3
40	9
41	1
42	6
43	1
44	4
45	10
46	2
47	1
48	22
49	8
50	12
51	3
52	4
53	1
54	26
55	5
56	9
57	3
58	2
59	1
60	14
61	1
62	2
63	10
64	63
65	5
66	6
67	1
68	4
69	3
70	11
71	1
72	34
73	1
74	2
75	18
76	4
77	7
78	6
79	1
80	19
81	40
82	2
83	1
84	13
85	5
86	2
87	3
88	8
89	1
90	21
91	7
92	4
93	3
94	2
95	5

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

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