A071601 - cp's OEIS frontend

A071601 Numbers k such that k and phi(k) have the same number of 1's in their binary representation.

n	a(n)
1	1
2	2
3	4
4	8
5	9
6	16
7	18
8	32
9	33
10	36
11	49
12	64
13	65
14	66
15	69
16	72
17	77
18	98
19	99
20	121
21	128
22	130
23	132
24	138
25	141
26	144
27	145
28	154
29	169
30	177
31	196
32	198
33	209
34	225
35	242
36	256
37	260
38	261
39	264
40	265
41	276
42	282
43	288
44	290
45	297
46	305
47	308
48	325
49	338
50	354
51	361
52	392
53	396
54	418
55	441
56	450
57	484

[1, 2, 4, 8, 9, 16, 18, 32, 33, 36, 49, 64, 65, 66, 69, 72, 77, 98, 99, 121, 128, 130, 132, 138, 141, 144, 145, 154, 169, 177, 196, 198, 209, 225, 242, 256, 260, 261, 264, 265, 276, 282, 288, 290, 297, 305, 308, 325, 338, 354, 361, 392, 396, 418, 441, 450, 484]

cp's OEIS Frontend

A071601 Numbers k such that k and phi(k) have the same number of 1's in their binary representation.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	8
5	9
6	16
7	18
8	32
9	33
10	36
11	49
12	64
13	65
14	66
15	69
16	72
17	77
18	98
19	99
20	121
21	128
22	130
23	132
24	138
25	141
26	144
27	145
28	154
29	169
30	177
31	196
32	198
33	209
34	225
35	242
36	256
37	260
38	261
39	264
40	265
41	276
42	282
43	288
44	290
45	297
46	305
47	308
48	325
49	338
50	354
51	361
52	392
53	396
54	418
55	441
56	450
57	484

n	a(n)
1	1
2	2
3	4
4	8
5	9
6	16
7	18
8	32
9	33
10	36
11	49
12	64
13	65
14	66
15	69
16	72
17	77
18	98
19	99
20	121
21	128
22	130
23	132
24	138
25	141
26	144
27	145
28	154
29	169
30	177
31	196
32	198
33	209
34	225
35	242
36	256
37	260
38	261
39	264
40	265
41	276
42	282
43	288
44	290
45	297
46	305
47	308
48	325
49	338
50	354
51	361
52	392
53	396
54	418
55	441
56	450
57	484

n	a(n)
1	1
2	2
3	4
4	8
5	9
6	16
7	18
8	32
9	33
10	36
11	49
12	64
13	65
14	66
15	69
16	72
17	77
18	98
19	99
20	121
21	128
22	130
23	132
24	138
25	141
26	144
27	145
28	154
29	169
30	177
31	196
32	198
33	209
34	225
35	242
36	256
37	260
38	261
39	264
40	265
41	276
42	282
43	288
44	290
45	297
46	305
47	308
48	325
49	338
50	354
51	361
52	392
53	396
54	418
55	441
56	450
57	484