A306247 - cp's OEIS frontend

A306247 Numbers k such that 2k - p is not a prime where p is any prime divisor of 4k^2 - 1.

n	a(n)
1	1
2	2
3	3
4	6
5	9
6	14
7	15
8	19
9	21
10	26
11	29
12	30
13	34
14	36
15	40
16	48
17	49
18	51
19	54
20	61
21	63
22	64
23	69
24	74
25	75
26	79
27	82
28	84
29	86
30	89
31	90
32	95
33	96
34	99
35	103
36	106
37	110
38	111
39	112
40	114
41	119
42	120
43	135
44	139
45	141
46	146
47	147
48	149
49	151
50	152
51	153
52	154
53	156
54	161
55	166
56	169
57	173
58	174
59	179
60	180
61	184
62	186
63	187
64	190
65	194

[1, 2, 3, 6, 9, 14, 15, 19, 21, 26, 29, 30, 34, 36, 40, 48, 49, 51, 54, 61, 63, 64, 69, 74, 75, 79, 82, 84, 86, 89, 90, 95, 96, 99, 103, 106, 110, 111, 112, 114, 119, 120, 135, 139, 141, 146, 147, 149, 151, 152, 153, 154, 156, 161, 166, 169, 173, 174, 179, 180, 184, 186, 187, 190, 194]

cp's OEIS Frontend

A306247 Numbers k such that 2k - p is not a prime where p is any prime divisor of 4k^2 - 1.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	6
5	9
6	14
7	15
8	19
9	21
10	26
11	29
12	30
13	34
14	36
15	40
16	48
17	49
18	51
19	54
20	61
21	63
22	64
23	69
24	74
25	75
26	79
27	82
28	84
29	86
30	89
31	90
32	95
33	96
34	99
35	103
36	106
37	110
38	111
39	112
40	114
41	119
42	120
43	135
44	139
45	141
46	146
47	147
48	149
49	151
50	152
51	153
52	154
53	156
54	161
55	166
56	169
57	173
58	174
59	179
60	180
61	184
62	186
63	187
64	190
65	194

n	a(n)
1	1
2	2
3	3
4	6
5	9
6	14
7	15
8	19
9	21
10	26
11	29
12	30
13	34
14	36
15	40
16	48
17	49
18	51
19	54
20	61
21	63
22	64
23	69
24	74
25	75
26	79
27	82
28	84
29	86
30	89
31	90
32	95
33	96
34	99
35	103
36	106
37	110
38	111
39	112
40	114
41	119
42	120
43	135
44	139
45	141
46	146
47	147
48	149
49	151
50	152
51	153
52	154
53	156
54	161
55	166
56	169
57	173
58	174
59	179
60	180
61	184
62	186
63	187
64	190
65	194

n	a(n)
1	1
2	2
3	3
4	6
5	9
6	14
7	15
8	19
9	21
10	26
11	29
12	30
13	34
14	36
15	40
16	48
17	49
18	51
19	54
20	61
21	63
22	64
23	69
24	74
25	75
26	79
27	82
28	84
29	86
30	89
31	90
32	95
33	96
34	99
35	103
36	106
37	110
38	111
39	112
40	114
41	119
42	120
43	135
44	139
45	141
46	146
47	147
48	149
49	151
50	152
51	153
52	154
53	156
54	161
55	166
56	169
57	173
58	174
59	179
60	180
61	184
62	186
63	187
64	190
65	194