A336456 - cp's OEIS frontend

A336456 a(n) = A335915(sigma(sigma(n))), where A335915 is a fully multiplicative sequence with a(2) = 1 and a(p) = A000265(p^2 - 1) for odd primes p, with A000265(k) giving the odd part of k.

n	a(n)
1	1
2	1
3	3
4	1
5	1
6	3
7	3
8	1
9	3
10	21
11	3
12	3
13	1
14	3
15	3
16	1
17	21
18	3
19	3
20	1
21	3
22	63
23	3
24	3
25	1
26	1
27	3
28	3
29	1
30	63
31	3
32	21
33	15
34	3
35	15
36	3
37	3
38	3
39	3
40	21
41	1
42	3
43	3
44	3
45	3
46	63
47	15
48	3
49	3
50	1
51	63
52	45
53	3
54	3
55	63
56	3
57	15
58	21
59	3
60	3
61	1
62	3
63	9
64	1
65	3
66	315
67	3
68	21
69	3
70	315
71	63
72	3
73	45
74	3
75	3
76	3
77	3
78	3
79	15
80	1
81	135
82	21
83	3
84	3
85	9
86	3
87	3
88	63
89	21
90	63
91	15
92	3
93	27
94	315

[1, 1, 3, 1, 1, 3, 3, 1, 3, 21, 3, 3, 1, 3, 3, 1, 21, 3, 3, 1, 3, 63, 3, 3, 1, 1, 3, 3, 1, 63, 3, 21, 15, 3, 15, 3, 3, 3, 3, 21, 1, 3, 3, 3, 3, 63, 15, 3, 3, 1, 63, 45, 3, 3, 63, 3, 15, 21, 3, 3, 1, 3, 9, 1, 3, 315, 3, 21, 3, 315, 63, 3, 45, 3, 3, 3, 3, 3, 15, 1, 135, 21, 3, 3, 9, 3, 3, 63, 21, 63, 15, 3, 27, 315]

cp's OEIS Frontend

A336456 a(n) = A335915(sigma(sigma(n))), where A335915 is a fully multiplicative sequence with a(2) = 1 and a(p) = A000265(p^2 - 1) for odd primes p, with A000265(k) giving the odd part of k.

Table of values

List of values

n	a(n)
1	1
2	1
3	3
4	1
5	1
6	3
7	3
8	1
9	3
10	21
11	3
12	3
13	1
14	3
15	3
16	1
17	21
18	3
19	3
20	1
21	3
22	63
23	3
24	3
25	1
26	1
27	3
28	3
29	1
30	63
31	3
32	21
33	15
34	3
35	15
36	3
37	3
38	3
39	3
40	21
41	1
42	3
43	3
44	3
45	3
46	63
47	15
48	3
49	3
50	1
51	63
52	45
53	3
54	3
55	63
56	3
57	15
58	21
59	3
60	3
61	1
62	3
63	9
64	1
65	3
66	315
67	3
68	21
69	3
70	315
71	63
72	3
73	45
74	3
75	3
76	3
77	3
78	3
79	15
80	1
81	135
82	21
83	3
84	3
85	9
86	3
87	3
88	63
89	21
90	63
91	15
92	3
93	27
94	315

n	a(n)
1	1
2	1
3	3
4	1
5	1
6	3
7	3
8	1
9	3
10	21
11	3
12	3
13	1
14	3
15	3
16	1
17	21
18	3
19	3
20	1
21	3
22	63
23	3
24	3
25	1
26	1
27	3
28	3
29	1
30	63
31	3
32	21
33	15
34	3
35	15
36	3
37	3
38	3
39	3
40	21
41	1
42	3
43	3
44	3
45	3
46	63
47	15
48	3
49	3
50	1
51	63
52	45
53	3
54	3
55	63
56	3
57	15
58	21
59	3
60	3
61	1
62	3
63	9
64	1
65	3
66	315
67	3
68	21
69	3
70	315
71	63
72	3
73	45
74	3
75	3
76	3
77	3
78	3
79	15
80	1
81	135
82	21
83	3
84	3
85	9
86	3
87	3
88	63
89	21
90	63
91	15
92	3
93	27
94	315

n	a(n)
1	1
2	1
3	3
4	1
5	1
6	3
7	3
8	1
9	3
10	21
11	3
12	3
13	1
14	3
15	3
16	1
17	21
18	3
19	3
20	1
21	3
22	63
23	3
24	3
25	1
26	1
27	3
28	3
29	1
30	63
31	3
32	21
33	15
34	3
35	15
36	3
37	3
38	3
39	3
40	21
41	1
42	3
43	3
44	3
45	3
46	63
47	15
48	3
49	3
50	1
51	63
52	45
53	3
54	3
55	63
56	3
57	15
58	21
59	3
60	3
61	1
62	3
63	9
64	1
65	3
66	315
67	3
68	21
69	3
70	315
71	63
72	3
73	45
74	3
75	3
76	3
77	3
78	3
79	15
80	1
81	135
82	21
83	3
84	3
85	9
86	3
87	3
88	63
89	21
90	63
91	15
92	3
93	27
94	315