A112753 - cp's OEIS frontend

A112753 Number of distinct prime factors of n-th number of the form 3^i*5^j.

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	2
10	1
11	1
12	2
13	2
14	1
15	2
16	2
17	1
18	2
19	1
20	2
21	2
22	2
23	2
24	1
25	1
26	2
27	2
28	2
29	2
30	1
31	2
32	2
33	2
34	1
35	2
36	2
37	1
38	2
39	2
40	2
41	2
42	2
43	2
44	1
45	1
46	2
47	2
48	2
49	2
50	2
51	2
52	1
53	2
54	2
55	2
56	2
57	1
58	2
59	2
60	2
61	1
62	2
63	2
64	2
65	2
66	2
67	2
68	2
69	2
70	1
71	1
72	2
73	2
74	2
75	2
76	2
77	2
78	2
79	2
80	1
81	2
82	2
83	2
84	2
85	2
86	1
87	2
88	2
89	2
90	2
91	1
92	2
93	2
94	2
95	2
96	2
97	2
98	2
99	2
100	2
101	2
102	1
103	1
104	2
105	2

[0, 1, 1, 1, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 2, 2, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2]

cp's OEIS Frontend

A112753 Number of distinct 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	1
5	2
6	1
7	1
8	2
9	2
10	1
11	1
12	2
13	2
14	1
15	2
16	2
17	1
18	2
19	1
20	2
21	2
22	2
23	2
24	1
25	1
26	2
27	2
28	2
29	2
30	1
31	2
32	2
33	2
34	1
35	2
36	2
37	1
38	2
39	2
40	2
41	2
42	2
43	2
44	1
45	1
46	2
47	2
48	2
49	2
50	2
51	2
52	1
53	2
54	2
55	2
56	2
57	1
58	2
59	2
60	2
61	1
62	2
63	2
64	2
65	2
66	2
67	2
68	2
69	2
70	1
71	1
72	2
73	2
74	2
75	2
76	2
77	2
78	2
79	2
80	1
81	2
82	2
83	2
84	2
85	2
86	1
87	2
88	2
89	2
90	2
91	1
92	2
93	2
94	2
95	2
96	2
97	2
98	2
99	2
100	2
101	2
102	1
103	1
104	2
105	2

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	2
10	1
11	1
12	2
13	2
14	1
15	2
16	2
17	1
18	2
19	1
20	2
21	2
22	2
23	2
24	1
25	1
26	2
27	2
28	2
29	2
30	1
31	2
32	2
33	2
34	1
35	2
36	2
37	1
38	2
39	2
40	2
41	2
42	2
43	2
44	1
45	1
46	2
47	2
48	2
49	2
50	2
51	2
52	1
53	2
54	2
55	2
56	2
57	1
58	2
59	2
60	2
61	1
62	2
63	2
64	2
65	2
66	2
67	2
68	2
69	2
70	1
71	1
72	2
73	2
74	2
75	2
76	2
77	2
78	2
79	2
80	1
81	2
82	2
83	2
84	2
85	2
86	1
87	2
88	2
89	2
90	2
91	1
92	2
93	2
94	2
95	2
96	2
97	2
98	2
99	2
100	2
101	2
102	1
103	1
104	2
105	2

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	2
10	1
11	1
12	2
13	2
14	1
15	2
16	2
17	1
18	2
19	1
20	2
21	2
22	2
23	2
24	1
25	1
26	2
27	2
28	2
29	2
30	1
31	2
32	2
33	2
34	1
35	2
36	2
37	1
38	2
39	2
40	2
41	2
42	2
43	2
44	1
45	1
46	2
47	2
48	2
49	2
50	2
51	2
52	1
53	2
54	2
55	2
56	2
57	1
58	2
59	2
60	2
61	1
62	2
63	2
64	2
65	2
66	2
67	2
68	2
69	2
70	1
71	1
72	2
73	2
74	2
75	2
76	2
77	2
78	2
79	2
80	1
81	2
82	2
83	2
84	2
85	2
86	1
87	2
88	2
89	2
90	2
91	1
92	2
93	2
94	2
95	2
96	2
97	2
98	2
99	2
100	2
101	2
102	1
103	1
104	2
105	2