A000091 - cp's OEIS frontend

A000091 Multiplicative with a(2^e) = 2 for k >= 1; a(3) = 2, a(3^e) = 0 for k >= 2; a(p^e) = 0 if p > 3 and p == -1 (mod 3); a(p^e) = 2 if p > 3 and p == 1 (mod 3).

n	a(n)
1	1
2	2
3	2
4	2
5	0
6	4
7	2
8	2
9	0
10	0
11	0
12	4
13	2
14	4
15	0
16	2
17	0
18	0
19	2
20	0
21	4
22	0
23	0
24	4
25	0
26	4
27	0
28	4
29	0
30	0
31	2
32	2
33	0
34	0
35	0
36	0
37	2
38	4
39	4
40	0
41	0
42	8
43	2
44	0
45	0
46	0
47	0
48	4
49	2
50	0
51	0
52	4
53	0
54	0
55	0
56	4
57	4
58	0
59	0
60	0
61	2
62	4
63	0
64	2
65	0
66	0
67	2
68	0
69	0
70	0
71	0
72	0
73	2
74	4
75	0
76	4
77	0
78	8
79	2
80	0
81	0
82	0
83	0
84	8
85	0
86	4
87	0
88	0
89	0
90	0
91	4
92	0
93	4
94	0
95	0
96	4
97	2
98	4
99	0
100	0
101	0
102	0
103	2
104	4
105	0

[1, 2, 2, 2, 0, 4, 2, 2, 0, 0, 0, 4, 2, 4, 0, 2, 0, 0, 2, 0, 4, 0, 0, 4, 0, 4, 0, 4, 0, 0, 2, 2, 0, 0, 0, 0, 2, 4, 4, 0, 0, 8, 2, 0, 0, 0, 0, 4, 2, 0, 0, 4, 0, 0, 0, 4, 4, 0, 0, 0, 2, 4, 0, 2, 0, 0, 2, 0, 0, 0, 0, 0, 2, 4, 0, 4, 0, 8, 2, 0, 0, 0, 0, 8, 0, 4, 0, 0, 0, 0, 4, 0, 4, 0, 0, 4, 2, 4, 0, 0, 0, 0, 2, 4, 0]

cp's OEIS Frontend

A000091 Multiplicative with a(2^e) = 2 for k >= 1; a(3) = 2, a(3^e) = 0 for k >= 2; a(p^e) = 0 if p > 3 and p == -1 (mod 3); a(p^e) = 2 if p > 3 and p == 1 (mod 3).

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	2
5	0
6	4
7	2
8	2
9	0
10	0
11	0
12	4
13	2
14	4
15	0
16	2
17	0
18	0
19	2
20	0
21	4
22	0
23	0
24	4
25	0
26	4
27	0
28	4
29	0
30	0
31	2
32	2
33	0
34	0
35	0
36	0
37	2
38	4
39	4
40	0
41	0
42	8
43	2
44	0
45	0
46	0
47	0
48	4
49	2
50	0
51	0
52	4
53	0
54	0
55	0
56	4
57	4
58	0
59	0
60	0
61	2
62	4
63	0
64	2
65	0
66	0
67	2
68	0
69	0
70	0
71	0
72	0
73	2
74	4
75	0
76	4
77	0
78	8
79	2
80	0
81	0
82	0
83	0
84	8
85	0
86	4
87	0
88	0
89	0
90	0
91	4
92	0
93	4
94	0
95	0
96	4
97	2
98	4
99	0
100	0
101	0
102	0
103	2
104	4
105	0

n	a(n)
1	1
2	2
3	2
4	2
5	0
6	4
7	2
8	2
9	0
10	0
11	0
12	4
13	2
14	4
15	0
16	2
17	0
18	0
19	2
20	0
21	4
22	0
23	0
24	4
25	0
26	4
27	0
28	4
29	0
30	0
31	2
32	2
33	0
34	0
35	0
36	0
37	2
38	4
39	4
40	0
41	0
42	8
43	2
44	0
45	0
46	0
47	0
48	4
49	2
50	0
51	0
52	4
53	0
54	0
55	0
56	4
57	4
58	0
59	0
60	0
61	2
62	4
63	0
64	2
65	0
66	0
67	2
68	0
69	0
70	0
71	0
72	0
73	2
74	4
75	0
76	4
77	0
78	8
79	2
80	0
81	0
82	0
83	0
84	8
85	0
86	4
87	0
88	0
89	0
90	0
91	4
92	0
93	4
94	0
95	0
96	4
97	2
98	4
99	0
100	0
101	0
102	0
103	2
104	4
105	0

n	a(n)
1	1
2	2
3	2
4	2
5	0
6	4
7	2
8	2
9	0
10	0
11	0
12	4
13	2
14	4
15	0
16	2
17	0
18	0
19	2
20	0
21	4
22	0
23	0
24	4
25	0
26	4
27	0
28	4
29	0
30	0
31	2
32	2
33	0
34	0
35	0
36	0
37	2
38	4
39	4
40	0
41	0
42	8
43	2
44	0
45	0
46	0
47	0
48	4
49	2
50	0
51	0
52	4
53	0
54	0
55	0
56	4
57	4
58	0
59	0
60	0
61	2
62	4
63	0
64	2
65	0
66	0
67	2
68	0
69	0
70	0
71	0
72	0
73	2
74	4
75	0
76	4
77	0
78	8
79	2
80	0
81	0
82	0
83	0
84	8
85	0
86	4
87	0
88	0
89	0
90	0
91	4
92	0
93	4
94	0
95	0
96	4
97	2
98	4
99	0
100	0
101	0
102	0
103	2
104	4
105	0