A330740 - cp's OEIS frontend

A330740 a(n) = min(n, A004488(n)), where A004488(n) is base-3 sum n+n without carries.

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

[0, 1, 1, 3, 4, 5, 3, 5, 4, 9, 10, 11, 12, 13, 14, 15, 16, 17, 9, 11, 10, 15, 17, 16, 12, 14, 13, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 27, 29, 28, 33, 35, 34, 30, 32, 31, 45, 47, 46, 51, 53, 52, 48, 50, 49, 36, 38, 37, 42, 44, 43, 39, 41, 40, 81]

cp's OEIS Frontend

A330740 a(n) = min(n, A004488(n)), where A004488(n) is base-3 sum n+n without carries.

Table of values

List of values

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

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

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