A049803 - cp's OEIS frontend

A049803 a(n) = n mod 3 + n mod 9 + ... + n mod 3^k, where 3^k <= n < 3^(k+1).

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

[0, 0, 0, 1, 2, 0, 1, 2, 0, 2, 4, 3, 5, 7, 6, 8, 10, 0, 2, 4, 3, 5, 7, 6, 8, 10, 0, 3, 6, 6, 9, 12, 12, 15, 18, 9, 12, 15, 15, 18, 21, 21, 24, 27, 18, 21, 24, 24, 27, 30, 30, 33, 36, 0, 3, 6, 6, 9, 12, 12, 15, 18, 9, 12, 15, 15, 18, 21, 21, 24, 27, 18]

cp's OEIS Frontend

A049803 a(n) = n mod 3 + n mod 9 + ... + n mod 3^k, where 3^k <= n < 3^(k+1).

Table of values

List of values

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

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

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