A378509 - cp's OEIS frontend

A378509 Totient numbers k for which there is no solution to the equation phi(phi(x)) = k.

n	a(n)
1	30
2	42
3	46
4	58
5	66
6	70
7	78
8	102
9	106
10	110
11	116
12	126
13	136
14	138
15	140
16	148
17	150
18	166
19	196
20	198
21	210
22	222
23	226
24	228
25	262
26	268
27	270
28	282
29	294
30	296
31	306
32	310
33	316
34	330
35	332
36	342
37	346
38	366
39	372
40	378
41	382
42	388
43	392
44	438
45	444
46	452
47	456
48	460
49	462
50	466
51	478
52	498
53	502
54	506

[30, 42, 46, 58, 66, 70, 78, 102, 106, 110, 116, 126, 136, 138, 140, 148, 150, 166, 196, 198, 210, 222, 226, 228, 262, 268, 270, 282, 294, 296, 306, 310, 316, 330, 332, 342, 346, 366, 372, 378, 382, 388, 392, 438, 444, 452, 456, 460, 462, 466, 478, 498, 502, 506]

cp's OEIS Frontend

A378509 Totient numbers k for which there is no solution to the equation phi(phi(x)) = k.

Table of values

List of values

n	a(n)
1	30
2	42
3	46
4	58
5	66
6	70
7	78
8	102
9	106
10	110
11	116
12	126
13	136
14	138
15	140
16	148
17	150
18	166
19	196
20	198
21	210
22	222
23	226
24	228
25	262
26	268
27	270
28	282
29	294
30	296
31	306
32	310
33	316
34	330
35	332
36	342
37	346
38	366
39	372
40	378
41	382
42	388
43	392
44	438
45	444
46	452
47	456
48	460
49	462
50	466
51	478
52	498
53	502
54	506

n	a(n)
1	30
2	42
3	46
4	58
5	66
6	70
7	78
8	102
9	106
10	110
11	116
12	126
13	136
14	138
15	140
16	148
17	150
18	166
19	196
20	198
21	210
22	222
23	226
24	228
25	262
26	268
27	270
28	282
29	294
30	296
31	306
32	310
33	316
34	330
35	332
36	342
37	346
38	366
39	372
40	378
41	382
42	388
43	392
44	438
45	444
46	452
47	456
48	460
49	462
50	466
51	478
52	498
53	502
54	506

n	a(n)
1	30
2	42
3	46
4	58
5	66
6	70
7	78
8	102
9	106
10	110
11	116
12	126
13	136
14	138
15	140
16	148
17	150
18	166
19	196
20	198
21	210
22	222
23	226
24	228
25	262
26	268
27	270
28	282
29	294
30	296
31	306
32	310
33	316
34	330
35	332
36	342
37	346
38	366
39	372
40	378
41	382
42	388
43	392
44	438
45	444
46	452
47	456
48	460
49	462
50	466
51	478
52	498
53	502
54	506