A233867 - cp's OEIS frontend

A233867 a(n) = |{0 < m < 2n: m is a square with 2n - 1 - phi(m) prime}|, where phi(.) is Euler's totient function (A000010).

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

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

cp's OEIS Frontend

A233867 a(n) = |{0 < m < 2n: m is a square with 2n - 1 - phi(m) prime}|, where phi(.) is Euler's totient function (A000010).

Table of values

List of values

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

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

cp's OEIS Frontend

A233867 a(n) = |{0 < m < 2*n: m is a square with 2*n - 1 - phi(m) prime}|, where phi(.) is Euler's totient function (A000010).

Table of values

List of values

A233867 a(n) = |{0 < m < 2n: m is a square with 2n - 1 - phi(m) prime}|, where phi(.) is Euler's totient function (A000010).

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