A279431 - cp's OEIS frontend

A279431 Numbers k such that k^2 has an odd number of digits in base 2 and the middle digit is 1.

n	a(n)
1	1
2	11
3	20
4	21
5	38
6	39
7	42
8	43
9	45
10	72
11	73
12	74
13	75
14	78
15	79
16	82
17	83
18	86
19	88
20	89
21	140
22	141
23	142
24	143
25	148
26	149
27	150
28	154
29	155
30	158
31	159
32	162
33	163
34	166
35	167
36	169
37	170
38	172
39	173
40	175
41	178
42	180
43	181
44	272
45	273
46	274
47	275
48	276
49	277
50	278
51	284
52	285
53	286
54	287
55	292
56	293

[1, 11, 20, 21, 38, 39, 42, 43, 45, 72, 73, 74, 75, 78, 79, 82, 83, 86, 88, 89, 140, 141, 142, 143, 148, 149, 150, 154, 155, 158, 159, 162, 163, 166, 167, 169, 170, 172, 173, 175, 178, 180, 181, 272, 273, 274, 275, 276, 277, 278, 284, 285, 286, 287, 292, 293]

cp's OEIS Frontend

A279431 Numbers k such that k^2 has an odd number of digits in base 2 and the middle digit is 1.

Table of values

List of values

n	a(n)
1	1
2	11
3	20
4	21
5	38
6	39
7	42
8	43
9	45
10	72
11	73
12	74
13	75
14	78
15	79
16	82
17	83
18	86
19	88
20	89
21	140
22	141
23	142
24	143
25	148
26	149
27	150
28	154
29	155
30	158
31	159
32	162
33	163
34	166
35	167
36	169
37	170
38	172
39	173
40	175
41	178
42	180
43	181
44	272
45	273
46	274
47	275
48	276
49	277
50	278
51	284
52	285
53	286
54	287
55	292
56	293

n	a(n)
1	1
2	11
3	20
4	21
5	38
6	39
7	42
8	43
9	45
10	72
11	73
12	74
13	75
14	78
15	79
16	82
17	83
18	86
19	88
20	89
21	140
22	141
23	142
24	143
25	148
26	149
27	150
28	154
29	155
30	158
31	159
32	162
33	163
34	166
35	167
36	169
37	170
38	172
39	173
40	175
41	178
42	180
43	181
44	272
45	273
46	274
47	275
48	276
49	277
50	278
51	284
52	285
53	286
54	287
55	292
56	293

n	a(n)
1	1
2	11
3	20
4	21
5	38
6	39
7	42
8	43
9	45
10	72
11	73
12	74
13	75
14	78
15	79
16	82
17	83
18	86
19	88
20	89
21	140
22	141
23	142
24	143
25	148
26	149
27	150
28	154
29	155
30	158
31	159
32	162
33	163
34	166
35	167
36	169
37	170
38	172
39	173
40	175
41	178
42	180
43	181
44	272
45	273
46	274
47	275
48	276
49	277
50	278
51	284
52	285
53	286
54	287
55	292
56	293