A066362 - cp's OEIS frontend

A066362 a(n) = least k > n such that phi(k) < phi(n), if such a k exists; otherwise a(n) = 0.

n	a(n)
1	0
2	0
3	0
4	0
5	6
6	0
7	8
8	0
9	10
10	0
11	12
12	0
13	14
14	0
15	18
16	18
17	18
18	0
19	20
20	0
21	22
22	24
23	24
24	0
25	26
26	30
27	28
28	30
29	30
30	0
31	32
32	36
33	34
34	36
35	36
36	0
37	38
38	40
39	40
40	42
41	42
42	0
43	44
44	48
45	46
46	48
47	48
48	0
49	50
50	54
51	52
52	54
53	54
54	60
55	56
56	60
57	58
58	60
59	60
60	0
61	62
62	66
63	64
64	66
65	66
66	0
67	68
68	70
69	70
70	0
71	72
72	0
73	74
74	78
75	76
76	78
77	78
78	0

[0, 0, 0, 0, 6, 0, 8, 0, 10, 0, 12, 0, 14, 0, 18, 18, 18, 0, 20, 0, 22, 24, 24, 0, 26, 30, 28, 30, 30, 0, 32, 36, 34, 36, 36, 0, 38, 40, 40, 42, 42, 0, 44, 48, 46, 48, 48, 0, 50, 54, 52, 54, 54, 60, 56, 60, 58, 60, 60, 0, 62, 66, 64, 66, 66, 0, 68, 70, 70, 0, 72, 0, 74, 78, 76, 78, 78, 0]

cp's OEIS Frontend

A066362 a(n) = least k > n such that phi(k) < phi(n), if such a k exists; otherwise a(n) = 0.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	6
6	0
7	8
8	0
9	10
10	0
11	12
12	0
13	14
14	0
15	18
16	18
17	18
18	0
19	20
20	0
21	22
22	24
23	24
24	0
25	26
26	30
27	28
28	30
29	30
30	0
31	32
32	36
33	34
34	36
35	36
36	0
37	38
38	40
39	40
40	42
41	42
42	0
43	44
44	48
45	46
46	48
47	48
48	0
49	50
50	54
51	52
52	54
53	54
54	60
55	56
56	60
57	58
58	60
59	60
60	0
61	62
62	66
63	64
64	66
65	66
66	0
67	68
68	70
69	70
70	0
71	72
72	0
73	74
74	78
75	76
76	78
77	78
78	0

n	a(n)
1	0
2	0
3	0
4	0
5	6
6	0
7	8
8	0
9	10
10	0
11	12
12	0
13	14
14	0
15	18
16	18
17	18
18	0
19	20
20	0
21	22
22	24
23	24
24	0
25	26
26	30
27	28
28	30
29	30
30	0
31	32
32	36
33	34
34	36
35	36
36	0
37	38
38	40
39	40
40	42
41	42
42	0
43	44
44	48
45	46
46	48
47	48
48	0
49	50
50	54
51	52
52	54
53	54
54	60
55	56
56	60
57	58
58	60
59	60
60	0
61	62
62	66
63	64
64	66
65	66
66	0
67	68
68	70
69	70
70	0
71	72
72	0
73	74
74	78
75	76
76	78
77	78
78	0

n	a(n)
1	0
2	0
3	0
4	0
5	6
6	0
7	8
8	0
9	10
10	0
11	12
12	0
13	14
14	0
15	18
16	18
17	18
18	0
19	20
20	0
21	22
22	24
23	24
24	0
25	26
26	30
27	28
28	30
29	30
30	0
31	32
32	36
33	34
34	36
35	36
36	0
37	38
38	40
39	40
40	42
41	42
42	0
43	44
44	48
45	46
46	48
47	48
48	0
49	50
50	54
51	52
52	54
53	54
54	60
55	56
56	60
57	58
58	60
59	60
60	0
61	62
62	66
63	64
64	66
65	66
66	0
67	68
68	70
69	70
70	0
71	72
72	0
73	74
74	78
75	76
76	78
77	78
78	0