A074398 - cp's OEIS frontend

A074398 Number of primes between n and phi(n), with neither n nor phi(n) included in the count in case they are primes.

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

[0, 0, 0, 1, 0, 2, 0, 2, 1, 2, 0, 3, 0, 3, 2, 2, 0, 4, 0, 4, 3, 4, 0, 5, 1, 4, 2, 4, 0, 6, 0, 5, 3, 5, 2, 6, 0, 5, 3, 6, 0, 8, 0, 6, 5, 6, 0, 9, 2, 7, 4, 6, 0, 9, 4, 7, 5, 7, 0, 11, 0, 8, 7, 7, 3, 10, 0, 8, 5, 10, 0, 11, 0, 10, 9, 10, 4, 12, 0, 11, 6, 10, 0, 14, 5, 10, 7, 11, 0, 15, 4, 10, 7, 10, 4, 13, 0]

cp's OEIS Frontend

A074398 Number of primes between n and phi(n), with neither n nor phi(n) included in the count in case they are primes.

Table of values

List of values

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

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

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