A108809 - cp's OEIS frontend

A108809 Numbers n such that both n+(n-1)^2 and n+(n+1)^2 are primes.

n	a(n)
1	2
2	3
3	4
4	7
5	9
6	15
7	18
8	25
9	34
10	55
11	58
12	63
13	67
14	100
15	102
16	139
17	144
18	148
19	154
20	162
21	163
22	168
23	190
24	195
25	219
26	232
27	247
28	267
29	280
30	289
31	330
32	349
33	379
34	384
35	417
36	427
37	448
38	454
39	477
40	568
41	580
42	643
43	645
44	669
45	672
46	727
47	762
48	793
49	802
50	813
51	837
52	847
53	900
54	975
55	988
56	993

[2, 3, 4, 7, 9, 15, 18, 25, 34, 55, 58, 63, 67, 100, 102, 139, 144, 148, 154, 162, 163, 168, 190, 195, 219, 232, 247, 267, 280, 289, 330, 349, 379, 384, 417, 427, 448, 454, 477, 568, 580, 643, 645, 669, 672, 727, 762, 793, 802, 813, 837, 847, 900, 975, 988, 993]

cp's OEIS Frontend

A108809 Numbers n such that both n+(n-1)^2 and n+(n+1)^2 are primes.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	7
5	9
6	15
7	18
8	25
9	34
10	55
11	58
12	63
13	67
14	100
15	102
16	139
17	144
18	148
19	154
20	162
21	163
22	168
23	190
24	195
25	219
26	232
27	247
28	267
29	280
30	289
31	330
32	349
33	379
34	384
35	417
36	427
37	448
38	454
39	477
40	568
41	580
42	643
43	645
44	669
45	672
46	727
47	762
48	793
49	802
50	813
51	837
52	847
53	900
54	975
55	988
56	993

n	a(n)
1	2
2	3
3	4
4	7
5	9
6	15
7	18
8	25
9	34
10	55
11	58
12	63
13	67
14	100
15	102
16	139
17	144
18	148
19	154
20	162
21	163
22	168
23	190
24	195
25	219
26	232
27	247
28	267
29	280
30	289
31	330
32	349
33	379
34	384
35	417
36	427
37	448
38	454
39	477
40	568
41	580
42	643
43	645
44	669
45	672
46	727
47	762
48	793
49	802
50	813
51	837
52	847
53	900
54	975
55	988
56	993

n	a(n)
1	2
2	3
3	4
4	7
5	9
6	15
7	18
8	25
9	34
10	55
11	58
12	63
13	67
14	100
15	102
16	139
17	144
18	148
19	154
20	162
21	163
22	168
23	190
24	195
25	219
26	232
27	247
28	267
29	280
30	289
31	330
32	349
33	379
34	384
35	417
36	427
37	448
38	454
39	477
40	568
41	580
42	643
43	645
44	669
45	672
46	727
47	762
48	793
49	802
50	813
51	837
52	847
53	900
54	975
55	988
56	993