A065338 - cp's OEIS frontend

A065338 a(1) = 1, a(p) = p mod 4 for p prime and a(u * v) = a(u) * a(v) for u, v > 0.

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

[1, 2, 3, 4, 1, 6, 3, 8, 9, 2, 3, 12, 1, 6, 3, 16, 1, 18, 3, 4, 9, 6, 3, 24, 1, 2, 27, 12, 1, 6, 3, 32, 9, 2, 3, 36, 1, 6, 3, 8, 1, 18, 3, 12, 9, 6, 3, 48, 9, 2, 3, 4, 1, 54, 3, 24, 9, 2, 3, 12, 1, 6, 27, 64, 1, 18, 3, 4, 9, 6, 3, 72, 1, 2, 3, 12, 9, 6, 3, 16, 81, 2, 3, 36, 1, 6, 3, 24, 1, 18, 3]

cp's OEIS Frontend

A065338 a(1) = 1, a(p) = p mod 4 for p prime and a(u * v) = a(u) * a(v) for u, v > 0.

Table of values

List of values

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

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

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