A037839 - cp's OEIS frontend

A037839 a(n) = Sum{|d(i)-d(i-1)|: i=1,...,m}, where Sum{d(i)*7^i: i=0,1,...,m} is the base 7 representation of n.

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

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

cp's OEIS Frontend

A037839 a(n) = Sum{|d(i)-d(i-1)|: i=1,...,m}, where Sum{d(i)*7^i: i=0,1,...,m} is the base 7 representation of n.

Table of values

List of values

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

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

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