A064920 - cp's OEIS frontend

A064920 a(n) = n/gpf(n) + gpf(n) - 1, where gpf = A006530 = greatest prime factor.

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

[2, 3, 3, 5, 4, 7, 5, 5, 6, 11, 6, 13, 8, 7, 9, 17, 8, 19, 8, 9, 12, 23, 10, 9, 14, 11, 10, 29, 10, 31, 17, 13, 18, 11, 14, 37, 20, 15, 12, 41, 12, 43, 14, 13, 24, 47, 18, 13, 14, 19, 16, 53, 20, 15, 14, 21, 30, 59, 16, 61, 32, 15, 33, 17, 16, 67, 20, 25, 16, 71, 26, 73, 38, 19, 22]

cp's OEIS Frontend

A064920 a(n) = n/gpf(n) + gpf(n) - 1, where gpf = A006530 = greatest prime factor.

Table of values

List of values

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

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

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