A090624 - cp's OEIS frontend

A090624 If n = Product(pj^ej), i.e., written in its prime factorization, then a(n) = max_j{(pj-1)*ej}.

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

[1, 2, 2, 4, 2, 6, 3, 4, 4, 10, 2, 12, 6, 4, 4, 16, 4, 18, 4, 6, 10, 22, 3, 8, 12, 6, 6, 28, 4, 30, 5, 10, 16, 6, 4, 36, 18, 12, 4, 40, 6, 42, 10, 4, 22, 46, 4, 12, 8, 16, 12, 52, 6, 10, 6, 18, 28, 58, 4, 60, 30, 6, 6, 12, 10, 66, 16, 22, 6, 70, 4, 72, 36, 8, 18, 10, 12, 78, 4, 8, 40, 82, 6]

cp's OEIS Frontend

A090624 If n = Product(pj^ej), i.e., written in its prime factorization, then a(n) = max_j{(pj-1)*ej}.

Table of values

List of values

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

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

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