A290103 - cp's OEIS frontend

A290103 a(n) = LCM of the prime indices in prime factorization of n, a(1) = 1.

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

[1, 1, 2, 1, 3, 2, 4, 1, 2, 3, 5, 2, 6, 4, 6, 1, 7, 2, 8, 3, 4, 5, 9, 2, 3, 6, 2, 4, 10, 6, 11, 1, 10, 7, 12, 2, 12, 8, 6, 3, 13, 4, 14, 5, 6, 9, 15, 2, 4, 3, 14, 6, 16, 2, 15, 4, 8, 10, 17, 6, 18, 11, 4, 1, 6, 10, 19, 7, 18, 12, 20, 2, 21, 12, 6, 8, 20, 6, 22, 3, 2, 13, 23, 4, 21, 14, 10, 5, 24, 6, 12, 9, 22, 15, 24, 2, 25, 4, 10, 3, 26, 14, 27, 6, 12]

cp's OEIS Frontend

A290103 a(n) = LCM of the prime indices in prime factorization of n, a(1) = 1.

Table of values

List of values

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

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

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