A212645 - cp's OEIS frontend

A212645 a(n) = number of excess prime divisors of A181800(n) (n-th powerful number that is the first integer of its prime signature).

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

[0, 1, 2, 3, 4, 2, 5, 3, 6, 4, 4, 7, 5, 5, 8, 6, 6, 3, 9, 7, 6, 7, 4, 10, 8, 7, 8, 5, 11, 9, 8, 5, 9, 6, 8, 12, 10, 9, 6, 10, 7, 9, 13, 11, 10, 7, 6, 11, 8, 10, 7, 14, 12, 11, 8, 4, 10, 7, 12, 9, 11, 8, 15, 13, 12, 9, 5, 11, 8, 13, 10, 12, 9, 16, 14, 8, 13, 10]

cp's OEIS Frontend

A212645 a(n) = number of excess prime divisors of A181800(n) (n-th powerful number that is the first integer of its prime signature).

Table of values

List of values

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

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

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