A057635 - cp's OEIS frontend

A057635 a(n) is the largest m such that phi(m) = n, where phi is Euler's totient function = A000010, or a(n) = 0 if no such m exists.

n	a(n)
1	2
2	6
3	0
4	12
5	0
6	18
7	0
8	30
9	0
10	22
11	0
12	42
13	0
14	0
15	0
16	60
17	0
18	54
19	0
20	66
21	0
22	46
23	0
24	90
25	0
26	0
27	0
28	58
29	0
30	62
31	0
32	120
33	0
34	0
35	0
36	126
37	0
38	0
39	0
40	150
41	0
42	98
43	0
44	138
45	0
46	94
47	0
48	210
49	0
50	0
51	0
52	106
53	0
54	162
55	0
56	174
57	0
58	118
59	0
60	198
61	0
62	0
63	0
64	240
65	0
66	134
67	0
68	0
69	0
70	142
71	0
72	270
73	0
74	0
75	0
76	0
77	0
78	158
79	0
80	330
81	0

[2, 6, 0, 12, 0, 18, 0, 30, 0, 22, 0, 42, 0, 0, 0, 60, 0, 54, 0, 66, 0, 46, 0, 90, 0, 0, 0, 58, 0, 62, 0, 120, 0, 0, 0, 126, 0, 0, 0, 150, 0, 98, 0, 138, 0, 94, 0, 210, 0, 0, 0, 106, 0, 162, 0, 174, 0, 118, 0, 198, 0, 0, 0, 240, 0, 134, 0, 0, 0, 142, 0, 270, 0, 0, 0, 0, 0, 158, 0, 330, 0]

cp's OEIS Frontend

A057635 a(n) is the largest m such that phi(m) = n, where phi is Euler's totient function = A000010, or a(n) = 0 if no such m exists.

Table of values

List of values

n	a(n)
1	2
2	6
3	0
4	12
5	0
6	18
7	0
8	30
9	0
10	22
11	0
12	42
13	0
14	0
15	0
16	60
17	0
18	54
19	0
20	66
21	0
22	46
23	0
24	90
25	0
26	0
27	0
28	58
29	0
30	62
31	0
32	120
33	0
34	0
35	0
36	126
37	0
38	0
39	0
40	150
41	0
42	98
43	0
44	138
45	0
46	94
47	0
48	210
49	0
50	0
51	0
52	106
53	0
54	162
55	0
56	174
57	0
58	118
59	0
60	198
61	0
62	0
63	0
64	240
65	0
66	134
67	0
68	0
69	0
70	142
71	0
72	270
73	0
74	0
75	0
76	0
77	0
78	158
79	0
80	330
81	0

n	a(n)
1	2
2	6
3	0
4	12
5	0
6	18
7	0
8	30
9	0
10	22
11	0
12	42
13	0
14	0
15	0
16	60
17	0
18	54
19	0
20	66
21	0
22	46
23	0
24	90
25	0
26	0
27	0
28	58
29	0
30	62
31	0
32	120
33	0
34	0
35	0
36	126
37	0
38	0
39	0
40	150
41	0
42	98
43	0
44	138
45	0
46	94
47	0
48	210
49	0
50	0
51	0
52	106
53	0
54	162
55	0
56	174
57	0
58	118
59	0
60	198
61	0
62	0
63	0
64	240
65	0
66	134
67	0
68	0
69	0
70	142
71	0
72	270
73	0
74	0
75	0
76	0
77	0
78	158
79	0
80	330
81	0

n	a(n)
1	2
2	6
3	0
4	12
5	0
6	18
7	0
8	30
9	0
10	22
11	0
12	42
13	0
14	0
15	0
16	60
17	0
18	54
19	0
20	66
21	0
22	46
23	0
24	90
25	0
26	0
27	0
28	58
29	0
30	62
31	0
32	120
33	0
34	0
35	0
36	126
37	0
38	0
39	0
40	150
41	0
42	98
43	0
44	138
45	0
46	94
47	0
48	210
49	0
50	0
51	0
52	106
53	0
54	162
55	0
56	174
57	0
58	118
59	0
60	198
61	0
62	0
63	0
64	240
65	0
66	134
67	0
68	0
69	0
70	142
71	0
72	270
73	0
74	0
75	0
76	0
77	0
78	158
79	0
80	330
81	0