A181819 - cp's OEIS frontend

A181819 Prime shadow of n: a(1) = 1; for n>1, if n = Product prime(i)^e(i), then a(n) = Product prime(e(i)).

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

[1, 2, 2, 3, 2, 4, 2, 5, 3, 4, 2, 6, 2, 4, 4, 7, 2, 6, 2, 6, 4, 4, 2, 10, 3, 4, 5, 6, 2, 8, 2, 11, 4, 4, 4, 9, 2, 4, 4, 10, 2, 8, 2, 6, 6, 4, 2, 14, 3, 6, 4, 6, 2, 10, 4, 10, 4, 4, 2, 12, 2, 4, 6, 13, 4, 8, 2, 6, 4, 8, 2, 15, 2, 4, 6, 6, 4, 8, 2, 14, 7, 4, 2, 12, 4, 4, 4, 10, 2, 12, 4, 6, 4, 4, 4, 22, 2, 6, 6, 9, 2, 8, 2, 10, 8]

cp's OEIS Frontend

A181819 Prime shadow of n: a(1) = 1; for n>1, if n = Product prime(i)^e(i), then a(n) = Product prime(e(i)).

Table of values

List of values

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

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

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