A267135 - cp's OEIS frontend

A267135 a(n) = n minus the number of primes of form 4m + 1 that are less than n-th prime of form 4m + 3.

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

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

cp's OEIS Frontend

A267135 a(n) = n minus the number of primes of form 4m + 1 that are less than n-th prime of form 4m + 3.

Table of values

List of values

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

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

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