A037845 - cp's OEIS frontend

A037845 a(n) = Sum_{i=1..m, d(i) d(i-1)-d(i), where Sum_{i=0..m} d(i)*4^i is the base 4 representation of n.

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

[0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 2, 3, 0, 0, 1, 2, 1, 1, 1, 2, 2, 2, 2, 2, 0, 1, 2, 3, 0, 0, 1, 2, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 2, 3, 0, 0, 1, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 2, 3, 1, 1, 2, 3, 2, 2, 2, 3, 3, 3, 3, 3, 0, 1, 2, 3, 0, 0, 1, 2, 1, 1, 1]

cp's OEIS Frontend

A037845 a(n) = Sum_{i=1..m, d(i) d(i-1)-d(i), where Sum_{i=0..m} d(i)*4^i is the base 4 representation of n.

Table of values

List of values

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

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

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