A348920 - cp's OEIS frontend

A348920 a(n) is the "real" part of f(n) = Sum_{k >= 0} g(d_k) * (4 + w)^k where g(0) = 0 and g(1 + u + 2v) = (1 + u) (1 + w)^v for any u = 0..1 and v = 0..5, Sum_{k >= 0} d_k * 13^k is the base-13 representation of n and w = -1/2 + sqrt(-3)/2 is a primitive cube root of unity; sequence A348921 gives "w" parts.

n	a(n)
0	0
1	1
2	2
3	1
4	2
5	0
6	0
7	-1
8	-2
9	-1
10	-2
11	0
12	0
13	4
14	5
15	6
16	5
17	6
18	4
19	4
20	3
21	2
22	3
23	2
24	4
25	4
26	8
27	9
28	10
29	9
30	10
31	8
32	8
33	7
34	6
35	7
36	6
37	8
38	8
39	3
40	4
41	5
42	4
43	5
44	3
45	3
46	2
47	1
48	2
49	1
50	3
51	3
52	6
53	7
54	8
55	7
56	8
57	6
58	6
59	5
60	4
61	5
62	4
63	6
64	6
65	-1
66	0
67	1
68	0
69	1
70	-1
71	-1
72	-2
73	-3
74	-2
75	-3
76	-1
77	-1
78	-2
79	-1
80	0

[0, 1, 2, 1, 2, 0, 0, -1, -2, -1, -2, 0, 0, 4, 5, 6, 5, 6, 4, 4, 3, 2, 3, 2, 4, 4, 8, 9, 10, 9, 10, 8, 8, 7, 6, 7, 6, 8, 8, 3, 4, 5, 4, 5, 3, 3, 2, 1, 2, 1, 3, 3, 6, 7, 8, 7, 8, 6, 6, 5, 4, 5, 4, 6, 6, -1, 0, 1, 0, 1, -1, -1, -2, -3, -2, -3, -1, -1, -2, -1, 0]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	1
4	2
5	0
6	0
7	-1
8	-2
9	-1
10	-2
11	0
12	0
13	4
14	5
15	6
16	5
17	6
18	4
19	4
20	3
21	2
22	3
23	2
24	4
25	4
26	8
27	9
28	10
29	9
30	10
31	8
32	8
33	7
34	6
35	7
36	6
37	8
38	8
39	3
40	4
41	5
42	4
43	5
44	3
45	3
46	2
47	1
48	2
49	1
50	3
51	3
52	6
53	7
54	8
55	7
56	8
57	6
58	6
59	5
60	4
61	5
62	4
63	6
64	6
65	-1
66	0
67	1
68	0
69	1
70	-1
71	-1
72	-2
73	-3
74	-2
75	-3
76	-1
77	-1
78	-2
79	-1
80	0

n	a(n)
0	0
1	1
2	2
3	1
4	2
5	0
6	0
7	-1
8	-2
9	-1
10	-2
11	0
12	0
13	4
14	5
15	6
16	5
17	6
18	4
19	4
20	3
21	2
22	3
23	2
24	4
25	4
26	8
27	9
28	10
29	9
30	10
31	8
32	8
33	7
34	6
35	7
36	6
37	8
38	8
39	3
40	4
41	5
42	4
43	5
44	3
45	3
46	2
47	1
48	2
49	1
50	3
51	3
52	6
53	7
54	8
55	7
56	8
57	6
58	6
59	5
60	4
61	5
62	4
63	6
64	6
65	-1
66	0
67	1
68	0
69	1
70	-1
71	-1
72	-2
73	-3
74	-2
75	-3
76	-1
77	-1
78	-2
79	-1
80	0

n	a(n)
0	0
1	1
2	2
3	1
4	2
5	0
6	0
7	-1
8	-2
9	-1
10	-2
11	0
12	0
13	4
14	5
15	6
16	5
17	6
18	4
19	4
20	3
21	2
22	3
23	2
24	4
25	4
26	8
27	9
28	10
29	9
30	10
31	8
32	8
33	7
34	6
35	7
36	6
37	8
38	8
39	3
40	4
41	5
42	4
43	5
44	3
45	3
46	2
47	1
48	2
49	1
50	3
51	3
52	6
53	7
54	8
55	7
56	8
57	6
58	6
59	5
60	4
61	5
62	4
63	6
64	6
65	-1
66	0
67	1
68	0
69	1
70	-1
71	-1
72	-2
73	-3
74	-2
75	-3
76	-1
77	-1
78	-2
79	-1
80	0