A117307 - cp's OEIS frontend

A117307 Numbers for which (phi(n))^2+phi(n)+1 is a prime number.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	9
8	13
9	14
10	15
11	16
12	18
13	20
14	21
15	24
16	25
17	26
18	28
19	30
20	33
21	35
22	36
23	39
24	42
25	44
26	45
27	50
28	52
29	56
30	66
31	67
32	70
33	72
34	78
35	79
36	81
37	84
38	90
39	121
40	123
41	134
42	139
43	151
44	158
45	162
46	163
47	164
48	165
49	176
50	193
51	200
52	203
53	215
54	220
55	221
56	242
57	243
58	245
59	246
60	249

[1, 2, 3, 4, 6, 7, 9, 13, 14, 15, 16, 18, 20, 21, 24, 25, 26, 28, 30, 33, 35, 36, 39, 42, 44, 45, 50, 52, 56, 66, 67, 70, 72, 78, 79, 81, 84, 90, 121, 123, 134, 139, 151, 158, 162, 163, 164, 165, 176, 193, 200, 203, 215, 220, 221, 242, 243, 245, 246, 249]

cp's OEIS Frontend

A117307 Numbers for which (phi(n))^2+phi(n)+1 is a prime number.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	9
8	13
9	14
10	15
11	16
12	18
13	20
14	21
15	24
16	25
17	26
18	28
19	30
20	33
21	35
22	36
23	39
24	42
25	44
26	45
27	50
28	52
29	56
30	66
31	67
32	70
33	72
34	78
35	79
36	81
37	84
38	90
39	121
40	123
41	134
42	139
43	151
44	158
45	162
46	163
47	164
48	165
49	176
50	193
51	200
52	203
53	215
54	220
55	221
56	242
57	243
58	245
59	246
60	249

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	9
8	13
9	14
10	15
11	16
12	18
13	20
14	21
15	24
16	25
17	26
18	28
19	30
20	33
21	35
22	36
23	39
24	42
25	44
26	45
27	50
28	52
29	56
30	66
31	67
32	70
33	72
34	78
35	79
36	81
37	84
38	90
39	121
40	123
41	134
42	139
43	151
44	158
45	162
46	163
47	164
48	165
49	176
50	193
51	200
52	203
53	215
54	220
55	221
56	242
57	243
58	245
59	246
60	249

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	9
8	13
9	14
10	15
11	16
12	18
13	20
14	21
15	24
16	25
17	26
18	28
19	30
20	33
21	35
22	36
23	39
24	42
25	44
26	45
27	50
28	52
29	56
30	66
31	67
32	70
33	72
34	78
35	79
36	81
37	84
38	90
39	121
40	123
41	134
42	139
43	151
44	158
45	162
46	163
47	164
48	165
49	176
50	193
51	200
52	203
53	215
54	220
55	221
56	242
57	243
58	245
59	246
60	249