A182005 - cp's OEIS frontend

A182005 Let s(n) = s_3(n) be digit sum of n in base 3. Consider iterations: a_1(n) = s(2^n), a_2(n) = s(2^n+a_1(n)),a_3(n)=s(2^n+a_2(n)),...The sequence lists those n for which these iterations are (eventually) periodic with period > 1.

n	a(n)
1	5
2	7
3	8
4	17
5	21
6	23
7	26
8	31
9	39
10	40
11	41
12	45
13	49
14	51
15	52
16	53
17	58
18	62
19	64
20	67
21	69
22	78
23	81
24	82
25	84
26	87
27	91
28	93
29	108
30	113
31	115
32	116
33	119
34	121
35	122
36	128
37	131
38	135
39	136
40	139
41	142
42	151
43	152
44	155
45	163
46	170
47	173
48	174
49	178
50	181
51	191
52	193
53	195
54	198
55	201

[5, 7, 8, 17, 21, 23, 26, 31, 39, 40, 41, 45, 49, 51, 52, 53, 58, 62, 64, 67, 69, 78, 81, 82, 84, 87, 91, 93, 108, 113, 115, 116, 119, 121, 122, 128, 131, 135, 136, 139, 142, 151, 152, 155, 163, 170, 173, 174, 178, 181, 191, 193, 195, 198, 201]

cp's OEIS Frontend

A182005 Let s(n) = s_3(n) be digit sum of n in base 3. Consider iterations: a_1(n) = s(2^n), a_2(n) = s(2^n+a_1(n)),a_3(n)=s(2^n+a_2(n)),...The sequence lists those n for which these iterations are (eventually) periodic with period > 1.

Table of values

List of values

n	a(n)
1	5
2	7
3	8
4	17
5	21
6	23
7	26
8	31
9	39
10	40
11	41
12	45
13	49
14	51
15	52
16	53
17	58
18	62
19	64
20	67
21	69
22	78
23	81
24	82
25	84
26	87
27	91
28	93
29	108
30	113
31	115
32	116
33	119
34	121
35	122
36	128
37	131
38	135
39	136
40	139
41	142
42	151
43	152
44	155
45	163
46	170
47	173
48	174
49	178
50	181
51	191
52	193
53	195
54	198
55	201

n	a(n)
1	5
2	7
3	8
4	17
5	21
6	23
7	26
8	31
9	39
10	40
11	41
12	45
13	49
14	51
15	52
16	53
17	58
18	62
19	64
20	67
21	69
22	78
23	81
24	82
25	84
26	87
27	91
28	93
29	108
30	113
31	115
32	116
33	119
34	121
35	122
36	128
37	131
38	135
39	136
40	139
41	142
42	151
43	152
44	155
45	163
46	170
47	173
48	174
49	178
50	181
51	191
52	193
53	195
54	198
55	201

n	a(n)
1	5
2	7
3	8
4	17
5	21
6	23
7	26
8	31
9	39
10	40
11	41
12	45
13	49
14	51
15	52
16	53
17	58
18	62
19	64
20	67
21	69
22	78
23	81
24	82
25	84
26	87
27	91
28	93
29	108
30	113
31	115
32	116
33	119
34	121
35	122
36	128
37	131
38	135
39	136
40	139
41	142
42	151
43	152
44	155
45	163
46	170
47	173
48	174
49	178
50	181
51	191
52	193
53	195
54	198
55	201