A221858 - cp's OEIS frontend

A221858 a(1)=2, a(2)=3, for n>=3, a(n) is the n-th number which is obtained by application of Eratosthenes-like sieve (with removing 1's) to sequence: odd part of digit sum of 2^m, m>=1.

n	a(n)
1	2
2	3
3	7
4	5
5	11
6	13
7	19
8	29
9	31
10	41
11	37
12	43
13	47
14	61
15	59
16	67
17	71
18	23
19	17
20	73
21	79
22	89
23	109
24	103
25	53
26	107
27	113
28	139
29	151
30	127
31	137
32	83
33	167
34	173
35	181
36	191
37	101
38	193
39	223
40	233
41	211
42	199
43	229
44	251
45	239
46	281
47	277
48	241
49	131
50	269
51	263
52	283
53	313
54	311
55	349
56	163
57	317
58	337
59	331
60	307

[2, 3, 7, 5, 11, 13, 19, 29, 31, 41, 37, 43, 47, 61, 59, 67, 71, 23, 17, 73, 79, 89, 109, 103, 53, 107, 113, 139, 151, 127, 137, 83, 167, 173, 181, 191, 101, 193, 223, 233, 211, 199, 229, 251, 239, 281, 277, 241, 131, 269, 263, 283, 313, 311, 349, 163, 317, 337, 331, 307]

cp's OEIS Frontend

A221858 a(1)=2, a(2)=3, for n>=3, a(n) is the n-th number which is obtained by application of Eratosthenes-like sieve (with removing 1's) to sequence: odd part of digit sum of 2^m, m>=1.

Table of values

List of values

n	a(n)
1	2
2	3
3	7
4	5
5	11
6	13
7	19
8	29
9	31
10	41
11	37
12	43
13	47
14	61
15	59
16	67
17	71
18	23
19	17
20	73
21	79
22	89
23	109
24	103
25	53
26	107
27	113
28	139
29	151
30	127
31	137
32	83
33	167
34	173
35	181
36	191
37	101
38	193
39	223
40	233
41	211
42	199
43	229
44	251
45	239
46	281
47	277
48	241
49	131
50	269
51	263
52	283
53	313
54	311
55	349
56	163
57	317
58	337
59	331
60	307

n	a(n)
1	2
2	3
3	7
4	5
5	11
6	13
7	19
8	29
9	31
10	41
11	37
12	43
13	47
14	61
15	59
16	67
17	71
18	23
19	17
20	73
21	79
22	89
23	109
24	103
25	53
26	107
27	113
28	139
29	151
30	127
31	137
32	83
33	167
34	173
35	181
36	191
37	101
38	193
39	223
40	233
41	211
42	199
43	229
44	251
45	239
46	281
47	277
48	241
49	131
50	269
51	263
52	283
53	313
54	311
55	349
56	163
57	317
58	337
59	331
60	307

n	a(n)
1	2
2	3
3	7
4	5
5	11
6	13
7	19
8	29
9	31
10	41
11	37
12	43
13	47
14	61
15	59
16	67
17	71
18	23
19	17
20	73
21	79
22	89
23	109
24	103
25	53
26	107
27	113
28	139
29	151
30	127
31	137
32	83
33	167
34	173
35	181
36	191
37	101
38	193
39	223
40	233
41	211
42	199
43	229
44	251
45	239
46	281
47	277
48	241
49	131
50	269
51	263
52	283
53	313
54	311
55	349
56	163
57	317
58	337
59	331
60	307