A046053 - cp's OEIS frontend

A046053 Total number of prime factors of the repunit R(n) = (10^n-1)/9.

n	a(n)
1	0
2	1
3	2
4	2
5	2
6	5
7	2
8	4
9	4
10	4
11	2
12	7
13	3
14	4
15	6
16	6
17	2
18	9
19	1
20	7
21	7
22	7
23	1
24	10
25	5
26	6
27	7
28	8
29	5
30	13
31	3
32	11
33	6
34	6
35	7
36	12
37	3
38	3
39	6
40	11
41	4
42	15
43	4
44	11
45	10
46	6
47	2
48	13
49	4
50	10
51	8
52	9
53	4
54	14
55	8
56	12
57	6
58	8
59	2
60	20
61	7
62	5
63	14
64	15
65	7
66	15
67	3
68	10
69	6
70	12
71	2
72	18
73	3
74	7
75	12
76	6
77	8
78	16
79	6
80	15
81	13
82	7
83	3
84	22
85	7
86	8
87	10
88	15
89	5

[0, 1, 2, 2, 2, 5, 2, 4, 4, 4, 2, 7, 3, 4, 6, 6, 2, 9, 1, 7, 7, 7, 1, 10, 5, 6, 7, 8, 5, 13, 3, 11, 6, 6, 7, 12, 3, 3, 6, 11, 4, 15, 4, 11, 10, 6, 2, 13, 4, 10, 8, 9, 4, 14, 8, 12, 6, 8, 2, 20, 7, 5, 14, 15, 7, 15, 3, 10, 6, 12, 2, 18, 3, 7, 12, 6, 8, 16, 6, 15, 13, 7, 3, 22, 7, 8, 10, 15, 5]

cp's OEIS Frontend

A046053 Total number of prime factors of the repunit R(n) = (10^n-1)/9.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	2
5	2
6	5
7	2
8	4
9	4
10	4
11	2
12	7
13	3
14	4
15	6
16	6
17	2
18	9
19	1
20	7
21	7
22	7
23	1
24	10
25	5
26	6
27	7
28	8
29	5
30	13
31	3
32	11
33	6
34	6
35	7
36	12
37	3
38	3
39	6
40	11
41	4
42	15
43	4
44	11
45	10
46	6
47	2
48	13
49	4
50	10
51	8
52	9
53	4
54	14
55	8
56	12
57	6
58	8
59	2
60	20
61	7
62	5
63	14
64	15
65	7
66	15
67	3
68	10
69	6
70	12
71	2
72	18
73	3
74	7
75	12
76	6
77	8
78	16
79	6
80	15
81	13
82	7
83	3
84	22
85	7
86	8
87	10
88	15
89	5

n	a(n)
1	0
2	1
3	2
4	2
5	2
6	5
7	2
8	4
9	4
10	4
11	2
12	7
13	3
14	4
15	6
16	6
17	2
18	9
19	1
20	7
21	7
22	7
23	1
24	10
25	5
26	6
27	7
28	8
29	5
30	13
31	3
32	11
33	6
34	6
35	7
36	12
37	3
38	3
39	6
40	11
41	4
42	15
43	4
44	11
45	10
46	6
47	2
48	13
49	4
50	10
51	8
52	9
53	4
54	14
55	8
56	12
57	6
58	8
59	2
60	20
61	7
62	5
63	14
64	15
65	7
66	15
67	3
68	10
69	6
70	12
71	2
72	18
73	3
74	7
75	12
76	6
77	8
78	16
79	6
80	15
81	13
82	7
83	3
84	22
85	7
86	8
87	10
88	15
89	5

n	a(n)
1	0
2	1
3	2
4	2
5	2
6	5
7	2
8	4
9	4
10	4
11	2
12	7
13	3
14	4
15	6
16	6
17	2
18	9
19	1
20	7
21	7
22	7
23	1
24	10
25	5
26	6
27	7
28	8
29	5
30	13
31	3
32	11
33	6
34	6
35	7
36	12
37	3
38	3
39	6
40	11
41	4
42	15
43	4
44	11
45	10
46	6
47	2
48	13
49	4
50	10
51	8
52	9
53	4
54	14
55	8
56	12
57	6
58	8
59	2
60	20
61	7
62	5
63	14
64	15
65	7
66	15
67	3
68	10
69	6
70	12
71	2
72	18
73	3
74	7
75	12
76	6
77	8
78	16
79	6
80	15
81	13
82	7
83	3
84	22
85	7
86	8
87	10
88	15
89	5