A366385 - cp's OEIS frontend

A366385 Divide n by its largest prime factor, then multiply with the index of that same prime; a(1) = 0 by convention.

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	4
7	4
8	4
9	6
10	6
11	5
12	8
13	6
14	8
15	9
16	8
17	7
18	12
19	8
20	12
21	12
22	10
23	9
24	16
25	15
26	12
27	18
28	16
29	10
30	18
31	11
32	16
33	15
34	14
35	20
36	24
37	12
38	16
39	18
40	24
41	13
42	24
43	14
44	20
45	27
46	18
47	15
48	32
49	28
50	30
51	21
52	24
53	16
54	36
55	25
56	32
57	24
58	20
59	17
60	36
61	18
62	22
63	36
64	32
65	30
66	30
67	19
68	28
69	27
70	40
71	20
72	48
73	21
74	24
75	45
76	32
77	35
78	36
79	22
80	48
81	54
82	26
83	23
84	48
85	35

[0, 1, 2, 2, 3, 4, 4, 4, 6, 6, 5, 8, 6, 8, 9, 8, 7, 12, 8, 12, 12, 10, 9, 16, 15, 12, 18, 16, 10, 18, 11, 16, 15, 14, 20, 24, 12, 16, 18, 24, 13, 24, 14, 20, 27, 18, 15, 32, 28, 30, 21, 24, 16, 36, 25, 32, 24, 20, 17, 36, 18, 22, 36, 32, 30, 30, 19, 28, 27, 40, 20, 48, 21, 24, 45, 32, 35, 36, 22, 48, 54, 26, 23, 48, 35]

cp's OEIS Frontend

A366385 Divide n by its largest prime factor, then multiply with the index of that same prime; a(1) = 0 by convention.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	4
7	4
8	4
9	6
10	6
11	5
12	8
13	6
14	8
15	9
16	8
17	7
18	12
19	8
20	12
21	12
22	10
23	9
24	16
25	15
26	12
27	18
28	16
29	10
30	18
31	11
32	16
33	15
34	14
35	20
36	24
37	12
38	16
39	18
40	24
41	13
42	24
43	14
44	20
45	27
46	18
47	15
48	32
49	28
50	30
51	21
52	24
53	16
54	36
55	25
56	32
57	24
58	20
59	17
60	36
61	18
62	22
63	36
64	32
65	30
66	30
67	19
68	28
69	27
70	40
71	20
72	48
73	21
74	24
75	45
76	32
77	35
78	36
79	22
80	48
81	54
82	26
83	23
84	48
85	35

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	4
7	4
8	4
9	6
10	6
11	5
12	8
13	6
14	8
15	9
16	8
17	7
18	12
19	8
20	12
21	12
22	10
23	9
24	16
25	15
26	12
27	18
28	16
29	10
30	18
31	11
32	16
33	15
34	14
35	20
36	24
37	12
38	16
39	18
40	24
41	13
42	24
43	14
44	20
45	27
46	18
47	15
48	32
49	28
50	30
51	21
52	24
53	16
54	36
55	25
56	32
57	24
58	20
59	17
60	36
61	18
62	22
63	36
64	32
65	30
66	30
67	19
68	28
69	27
70	40
71	20
72	48
73	21
74	24
75	45
76	32
77	35
78	36
79	22
80	48
81	54
82	26
83	23
84	48
85	35

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	4
7	4
8	4
9	6
10	6
11	5
12	8
13	6
14	8
15	9
16	8
17	7
18	12
19	8
20	12
21	12
22	10
23	9
24	16
25	15
26	12
27	18
28	16
29	10
30	18
31	11
32	16
33	15
34	14
35	20
36	24
37	12
38	16
39	18
40	24
41	13
42	24
43	14
44	20
45	27
46	18
47	15
48	32
49	28
50	30
51	21
52	24
53	16
54	36
55	25
56	32
57	24
58	20
59	17
60	36
61	18
62	22
63	36
64	32
65	30
66	30
67	19
68	28
69	27
70	40
71	20
72	48
73	21
74	24
75	45
76	32
77	35
78	36
79	22
80	48
81	54
82	26
83	23
84	48
85	35