A328830 - cp's OEIS frontend

A328830 The second prime shadow of n: a(1) = 1; for n > 1, a(n) = a(A003557(n)) * prime(A056169(n)) when A056169(n) > 0, otherwise a(n) = a(A003557(n)).

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

[1, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 4, 2, 3, 3, 2, 2, 4, 2, 4, 3, 3, 2, 4, 2, 3, 2, 4, 2, 5, 2, 2, 3, 3, 3, 3, 2, 3, 3, 4, 2, 5, 2, 4, 4, 3, 2, 4, 2, 4, 3, 4, 2, 4, 3, 4, 3, 3, 2, 6, 2, 3, 4, 2, 3, 5, 2, 4, 3, 5, 2, 4, 2, 3, 4, 4, 3, 5, 2, 4, 2, 3, 2, 6, 3, 3, 3, 4, 2, 6, 3, 4, 3, 3, 3, 4, 2, 4, 4, 3, 2, 5, 2, 4, 5]

cp's OEIS Frontend

A328830 The second prime shadow of n: a(1) = 1; for n > 1, a(n) = a(A003557(n)) * prime(A056169(n)) when A056169(n) > 0, otherwise a(n) = a(A003557(n)).

Table of values

List of values

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

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

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