A112754 - cp's OEIS frontend

A112754 Total number of prime factors of n-th number of the form 3^i*5^j.

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

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

cp's OEIS Frontend

A112754 Total number of prime factors of n-th number of the form 3^i*5^j.

Table of values

List of values

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

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

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