A293190 - cp's OEIS frontend

A293190 a(n) = |{A001597(n) <= k <= A001597(n+1): 2*k^2-1 is prime}|.

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

[3, 4, 1, 4, 6, 1, 1, 2, 9, 8, 6, 7, 7, 1, 3, 6, 8, 11, 8, 1, 6, 5, 11, 14, 4, 2, 12, 14, 16, 8, 6, 15, 13, 9, 16, 16, 15, 15, 13, 10, 6, 16, 21, 16, 11, 4, 8, 22, 23, 17, 20, 7, 8, 23, 18, 21, 4, 23, 13, 1, 4, 24, 28, 24, 24, 24, 8, 14, 23, 24, 25, 1, 24, 15, 2, 21, 29, 26, 24, 35, 27, 25, 31, 30, 31, 30, 24, 4, 30, 30, 32, 30, 35, 31, 13, 13, 33, 31, 29, 31]

cp's OEIS Frontend

A293190 a(n) = |{A001597(n) <= k <= A001597(n+1): 2*k^2-1 is prime}|.

Table of values

List of values

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

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

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