A234246 - cp's OEIS frontend

A234246 a(n) = |{0 < k < n: k*phi(n-k) + 1 is a square}|, where phi(.) is Euler's totient function.

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	0
7	2
8	1
9	1
10	3
11	2
12	1
13	1
14	2
15	3
16	4
17	5
18	4
19	2
20	2
21	2
22	5
23	4
24	1
25	5
26	4
27	4
28	3
29	2
30	8
31	5
32	2
33	1
34	3
35	9
36	5
37	9
38	4
39	4
40	6
41	2
42	4
43	9
44	5
45	5
46	7
47	9
48	3
49	1
50	10
51	6
52	8
53	3
54	6
55	4
56	5
57	7
58	8
59	3
60	5
61	5
62	4
63	6
64	6
65	10
66	14
67	8
68	3
69	3
70	6
71	9
72	5
73	7
74	7
75	9
76	2
77	8
78	8
79	9
80	5
81	6
82	6
83	6
84	8
85	9
86	7
87	9
88	4
89	5
90	9
91	10
92	8
93	8
94	7
95	14
96	9
97	5
98	7
99	6
100	10

[0, 0, 0, 1, 1, 0, 2, 1, 1, 3, 2, 1, 1, 2, 3, 4, 5, 4, 2, 2, 2, 5, 4, 1, 5, 4, 4, 3, 2, 8, 5, 2, 1, 3, 9, 5, 9, 4, 4, 6, 2, 4, 9, 5, 5, 7, 9, 3, 1, 10, 6, 8, 3, 6, 4, 5, 7, 8, 3, 5, 5, 4, 6, 6, 10, 14, 8, 3, 3, 6, 9, 5, 7, 7, 9, 2, 8, 8, 9, 5, 6, 6, 6, 8, 9, 7, 9, 4, 5, 9, 10, 8, 8, 7, 14, 9, 5, 7, 6, 10]

cp's OEIS Frontend

A234246 a(n) = |{0 < k < n: k*phi(n-k) + 1 is a square}|, where phi(.) is Euler's totient function.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	0
7	2
8	1
9	1
10	3
11	2
12	1
13	1
14	2
15	3
16	4
17	5
18	4
19	2
20	2
21	2
22	5
23	4
24	1
25	5
26	4
27	4
28	3
29	2
30	8
31	5
32	2
33	1
34	3
35	9
36	5
37	9
38	4
39	4
40	6
41	2
42	4
43	9
44	5
45	5
46	7
47	9
48	3
49	1
50	10
51	6
52	8
53	3
54	6
55	4
56	5
57	7
58	8
59	3
60	5
61	5
62	4
63	6
64	6
65	10
66	14
67	8
68	3
69	3
70	6
71	9
72	5
73	7
74	7
75	9
76	2
77	8
78	8
79	9
80	5
81	6
82	6
83	6
84	8
85	9
86	7
87	9
88	4
89	5
90	9
91	10
92	8
93	8
94	7
95	14
96	9
97	5
98	7
99	6
100	10

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	0
7	2
8	1
9	1
10	3
11	2
12	1
13	1
14	2
15	3
16	4
17	5
18	4
19	2
20	2
21	2
22	5
23	4
24	1
25	5
26	4
27	4
28	3
29	2
30	8
31	5
32	2
33	1
34	3
35	9
36	5
37	9
38	4
39	4
40	6
41	2
42	4
43	9
44	5
45	5
46	7
47	9
48	3
49	1
50	10
51	6
52	8
53	3
54	6
55	4
56	5
57	7
58	8
59	3
60	5
61	5
62	4
63	6
64	6
65	10
66	14
67	8
68	3
69	3
70	6
71	9
72	5
73	7
74	7
75	9
76	2
77	8
78	8
79	9
80	5
81	6
82	6
83	6
84	8
85	9
86	7
87	9
88	4
89	5
90	9
91	10
92	8
93	8
94	7
95	14
96	9
97	5
98	7
99	6
100	10

n	a(n)
1	0
2	0
3	0
4	1
5	1
6	0
7	2
8	1
9	1
10	3
11	2
12	1
13	1
14	2
15	3
16	4
17	5
18	4
19	2
20	2
21	2
22	5
23	4
24	1
25	5
26	4
27	4
28	3
29	2
30	8
31	5
32	2
33	1
34	3
35	9
36	5
37	9
38	4
39	4
40	6
41	2
42	4
43	9
44	5
45	5
46	7
47	9
48	3
49	1
50	10
51	6
52	8
53	3
54	6
55	4
56	5
57	7
58	8
59	3
60	5
61	5
62	4
63	6
64	6
65	10
66	14
67	8
68	3
69	3
70	6
71	9
72	5
73	7
74	7
75	9
76	2
77	8
78	8
79	9
80	5
81	6
82	6
83	6
84	8
85	9
86	7
87	9
88	4
89	5
90	9
91	10
92	8
93	8
94	7
95	14
96	9
97	5
98	7
99	6
100	10