A115561 - cp's OEIS frontend

A115561 a(n) = lpf((n/lpf(n))/lpf(n/lpf(n))), where lpf=A020639, least prime factor.

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

[1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 1, 1, 1, 2, 1, 3, 1, 5, 1, 1, 1, 2, 1, 1, 3, 7, 1, 5, 1, 2, 1, 1, 1, 3, 1, 1, 1, 2, 1, 7, 1, 11, 5, 1, 1, 2, 1, 5, 1, 13, 1, 3, 1, 2, 1, 1, 1, 3, 1, 1, 7, 2, 1, 11, 1, 17, 1, 7, 1, 2, 1, 1, 5, 19, 1, 13, 1, 2, 3, 1, 1, 3, 1, 1, 1, 2, 1, 3, 1, 23, 1, 1, 1, 2, 1, 7, 11, 5, 1]

cp's OEIS Frontend

A115561 a(n) = lpf((n/lpf(n))/lpf(n/lpf(n))), where lpf=A020639, least prime factor.

Table of values

List of values

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

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

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