A272328 - cp's OEIS frontend

A272328 Number of integers 1<=k<=n such that phi(n)=phi(n+k) where phi is Euler's totient function A000010.

n	a(n)
1	1
2	0
3	2
4	1
5	2
6	0
7	2
8	2
9	2
10	1
11	1
12	0
13	2
14	1
15	4
16	3
17	2
18	0
19	2
20	2
21	4
22	0
23	1
24	1
25	3
26	3
27	2
28	2
29	1
30	0
31	1
32	4
33	3
34	3
35	5
36	1
37	3
38	1
39	6
40	2
41	3
42	0
43	2
44	2
45	7
46	0
47	1
48	1
49	2
50	1
51	5
52	6
53	1
54	0
55	5
56	5
57	5
58	0
59	1
60	0
61	4
62	0
63	5
64	5
65	4
66	0
67	1
68	4
69	2
70	4
71	1
72	3
73	6
74	4
75	6
76	3
77	5
78	2
79	1
80	3
81	1
82	5
83	1
84	1
85	4
86	1
87	2

[1, 0, 2, 1, 2, 0, 2, 2, 2, 1, 1, 0, 2, 1, 4, 3, 2, 0, 2, 2, 4, 0, 1, 1, 3, 3, 2, 2, 1, 0, 1, 4, 3, 3, 5, 1, 3, 1, 6, 2, 3, 0, 2, 2, 7, 0, 1, 1, 2, 1, 5, 6, 1, 0, 5, 5, 5, 0, 1, 0, 4, 0, 5, 5, 4, 0, 1, 4, 2, 4, 1, 3, 6, 4, 6, 3, 5, 2, 1, 3, 1, 5, 1, 1, 4, 1, 2]

cp's OEIS Frontend

A272328 Number of integers 1<=k<=n such that phi(n)=phi(n+k) where phi is Euler's totient function A000010.

Table of values

List of values

n	a(n)
1	1
2	0
3	2
4	1
5	2
6	0
7	2
8	2
9	2
10	1
11	1
12	0
13	2
14	1
15	4
16	3
17	2
18	0
19	2
20	2
21	4
22	0
23	1
24	1
25	3
26	3
27	2
28	2
29	1
30	0
31	1
32	4
33	3
34	3
35	5
36	1
37	3
38	1
39	6
40	2
41	3
42	0
43	2
44	2
45	7
46	0
47	1
48	1
49	2
50	1
51	5
52	6
53	1
54	0
55	5
56	5
57	5
58	0
59	1
60	0
61	4
62	0
63	5
64	5
65	4
66	0
67	1
68	4
69	2
70	4
71	1
72	3
73	6
74	4
75	6
76	3
77	5
78	2
79	1
80	3
81	1
82	5
83	1
84	1
85	4
86	1
87	2

n	a(n)
1	1
2	0
3	2
4	1
5	2
6	0
7	2
8	2
9	2
10	1
11	1
12	0
13	2
14	1
15	4
16	3
17	2
18	0
19	2
20	2
21	4
22	0
23	1
24	1
25	3
26	3
27	2
28	2
29	1
30	0
31	1
32	4
33	3
34	3
35	5
36	1
37	3
38	1
39	6
40	2
41	3
42	0
43	2
44	2
45	7
46	0
47	1
48	1
49	2
50	1
51	5
52	6
53	1
54	0
55	5
56	5
57	5
58	0
59	1
60	0
61	4
62	0
63	5
64	5
65	4
66	0
67	1
68	4
69	2
70	4
71	1
72	3
73	6
74	4
75	6
76	3
77	5
78	2
79	1
80	3
81	1
82	5
83	1
84	1
85	4
86	1
87	2

n	a(n)
1	1
2	0
3	2
4	1
5	2
6	0
7	2
8	2
9	2
10	1
11	1
12	0
13	2
14	1
15	4
16	3
17	2
18	0
19	2
20	2
21	4
22	0
23	1
24	1
25	3
26	3
27	2
28	2
29	1
30	0
31	1
32	4
33	3
34	3
35	5
36	1
37	3
38	1
39	6
40	2
41	3
42	0
43	2
44	2
45	7
46	0
47	1
48	1
49	2
50	1
51	5
52	6
53	1
54	0
55	5
56	5
57	5
58	0
59	1
60	0
61	4
62	0
63	5
64	5
65	4
66	0
67	1
68	4
69	2
70	4
71	1
72	3
73	6
74	4
75	6
76	3
77	5
78	2
79	1
80	3
81	1
82	5
83	1
84	1
85	4
86	1
87	2