A211777 - cp's OEIS frontend

A211777 Numbers n such that Sum_{d_ phi(d_ is an integer, where d_ divisors of n that are less than n, phi(x) = A000010(x).

n	a(n)
1	2
2	3
3	5
4	7
5	8
6	11
7	12
8	13
9	17
10	19
11	23
12	29
13	31
14	32
15	37
16	41
17	43
18	47
19	53
20	59
21	61
22	67
23	71
24	73
25	79
26	80
27	81
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	128
38	131
39	137
40	139
41	149
42	151
43	157
44	163
45	167
46	173
47	179
48	181
49	189
50	191
51	193
52	196
53	197
54	199
55	211
56	223
57	227
58	229
59	233

[2, 3, 5, 7, 8, 11, 12, 13, 17, 19, 23, 29, 31, 32, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 80, 81, 83, 89, 97, 101, 103, 107, 109, 113, 127, 128, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 189, 191, 193, 196, 197, 199, 211, 223, 227, 229, 233]

cp's OEIS Frontend

A211777 Numbers n such that Sum_{d_ phi(d_ is an integer, where d_ divisors of n that are less than n, phi(x) = A000010(x).

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	7
5	8
6	11
7	12
8	13
9	17
10	19
11	23
12	29
13	31
14	32
15	37
16	41
17	43
18	47
19	53
20	59
21	61
22	67
23	71
24	73
25	79
26	80
27	81
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	128
38	131
39	137
40	139
41	149
42	151
43	157
44	163
45	167
46	173
47	179
48	181
49	189
50	191
51	193
52	196
53	197
54	199
55	211
56	223
57	227
58	229
59	233

n	a(n)
1	2
2	3
3	5
4	7
5	8
6	11
7	12
8	13
9	17
10	19
11	23
12	29
13	31
14	32
15	37
16	41
17	43
18	47
19	53
20	59
21	61
22	67
23	71
24	73
25	79
26	80
27	81
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	128
38	131
39	137
40	139
41	149
42	151
43	157
44	163
45	167
46	173
47	179
48	181
49	189
50	191
51	193
52	196
53	197
54	199
55	211
56	223
57	227
58	229
59	233

n	a(n)
1	2
2	3
3	5
4	7
5	8
6	11
7	12
8	13
9	17
10	19
11	23
12	29
13	31
14	32
15	37
16	41
17	43
18	47
19	53
20	59
21	61
22	67
23	71
24	73
25	79
26	80
27	81
28	83
29	89
30	97
31	101
32	103
33	107
34	109
35	113
36	127
37	128
38	131
39	137
40	139
41	149
42	151
43	157
44	163
45	167
46	173
47	179
48	181
49	189
50	191
51	193
52	196
53	197
54	199
55	211
56	223
57	227
58	229
59	233