A048288 - cp's OEIS frontend

A048288 Number of prime factors counted with multiplicity of the reverse concatenation of numbers from 1 to n.

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

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

cp's OEIS Frontend

A048288 Number of prime factors counted with multiplicity of the reverse concatenation of numbers from 1 to n.

Table of values

List of values

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

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

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