A228091 - cp's OEIS frontend

A228091 Numbers n for which there exists such a natural number k < n that k + bitcount(k) = n + bitcount(n), where bitcount(k) (A000120) gives the number of 1's in binary representation of nonnegative integer k.

n	a(n)
1	4
2	12
3	16
4	17
5	20
6	28
7	32
8	34
9	36
10	44
11	48
12	49
13	52
14	60
15	65
16	68
17	76
18	80
19	81
20	84
21	92
22	96
23	98
24	100
25	108
26	112
27	113
28	116
29	124
30	128
31	129
32	130
33	131
34	132
35	140
36	144
37	145
38	148
39	156
40	160
41	162
42	164
43	172
44	176
45	177
46	180
47	188
48	193
49	196
50	204
51	208
52	209
53	212
54	220
55	224
56	226
57	228

[4, 12, 16, 17, 20, 28, 32, 34, 36, 44, 48, 49, 52, 60, 65, 68, 76, 80, 81, 84, 92, 96, 98, 100, 108, 112, 113, 116, 124, 128, 129, 130, 131, 132, 140, 144, 145, 148, 156, 160, 162, 164, 172, 176, 177, 180, 188, 193, 196, 204, 208, 209, 212, 220, 224, 226, 228]

cp's OEIS Frontend

A228091 Numbers n for which there exists such a natural number k < n that k + bitcount(k) = n + bitcount(n), where bitcount(k) (A000120) gives the number of 1's in binary representation of nonnegative integer k.

Table of values

List of values

n	a(n)
1	4
2	12
3	16
4	17
5	20
6	28
7	32
8	34
9	36
10	44
11	48
12	49
13	52
14	60
15	65
16	68
17	76
18	80
19	81
20	84
21	92
22	96
23	98
24	100
25	108
26	112
27	113
28	116
29	124
30	128
31	129
32	130
33	131
34	132
35	140
36	144
37	145
38	148
39	156
40	160
41	162
42	164
43	172
44	176
45	177
46	180
47	188
48	193
49	196
50	204
51	208
52	209
53	212
54	220
55	224
56	226
57	228

n	a(n)
1	4
2	12
3	16
4	17
5	20
6	28
7	32
8	34
9	36
10	44
11	48
12	49
13	52
14	60
15	65
16	68
17	76
18	80
19	81
20	84
21	92
22	96
23	98
24	100
25	108
26	112
27	113
28	116
29	124
30	128
31	129
32	130
33	131
34	132
35	140
36	144
37	145
38	148
39	156
40	160
41	162
42	164
43	172
44	176
45	177
46	180
47	188
48	193
49	196
50	204
51	208
52	209
53	212
54	220
55	224
56	226
57	228

n	a(n)
1	4
2	12
3	16
4	17
5	20
6	28
7	32
8	34
9	36
10	44
11	48
12	49
13	52
14	60
15	65
16	68
17	76
18	80
19	81
20	84
21	92
22	96
23	98
24	100
25	108
26	112
27	113
28	116
29	124
30	128
31	129
32	130
33	131
34	132
35	140
36	144
37	145
38	148
39	156
40	160
41	162
42	164
43	172
44	176
45	177
46	180
47	188
48	193
49	196
50	204
51	208
52	209
53	212
54	220
55	224
56	226
57	228