A139221 - cp's OEIS frontend

A139221 Numbers k such that both 41+(k+k^2)/2 and 41+(k+k^2) are primes.

n	a(n)
1	0
2	3
3	11
4	20
5	23
6	27
7	32
8	39
9	48
10	51
11	59
12	60
13	83
14	108
15	111
16	116
17	128
18	132
19	135
20	171
21	188
22	203
23	212
24	227
25	240
26	263
27	275
28	315
29	324
30	356
31	359
32	363
33	384
34	392
35	447
36	476
37	479
38	515
39	528
40	588
41	627
42	647
43	648
44	672
45	731
46	759
47	780
48	804
49	839
50	864
51	875
52	900
53	903
54	968
55	975

[0, 3, 11, 20, 23, 27, 32, 39, 48, 51, 59, 60, 83, 108, 111, 116, 128, 132, 135, 171, 188, 203, 212, 227, 240, 263, 275, 315, 324, 356, 359, 363, 384, 392, 447, 476, 479, 515, 528, 588, 627, 647, 648, 672, 731, 759, 780, 804, 839, 864, 875, 900, 903, 968, 975]

cp's OEIS Frontend

A139221 Numbers k such that both 41+(k+k^2)/2 and 41+(k+k^2) are primes.

Table of values

List of values

n	a(n)
1	0
2	3
3	11
4	20
5	23
6	27
7	32
8	39
9	48
10	51
11	59
12	60
13	83
14	108
15	111
16	116
17	128
18	132
19	135
20	171
21	188
22	203
23	212
24	227
25	240
26	263
27	275
28	315
29	324
30	356
31	359
32	363
33	384
34	392
35	447
36	476
37	479
38	515
39	528
40	588
41	627
42	647
43	648
44	672
45	731
46	759
47	780
48	804
49	839
50	864
51	875
52	900
53	903
54	968
55	975

n	a(n)
1	0
2	3
3	11
4	20
5	23
6	27
7	32
8	39
9	48
10	51
11	59
12	60
13	83
14	108
15	111
16	116
17	128
18	132
19	135
20	171
21	188
22	203
23	212
24	227
25	240
26	263
27	275
28	315
29	324
30	356
31	359
32	363
33	384
34	392
35	447
36	476
37	479
38	515
39	528
40	588
41	627
42	647
43	648
44	672
45	731
46	759
47	780
48	804
49	839
50	864
51	875
52	900
53	903
54	968
55	975

n	a(n)
1	0
2	3
3	11
4	20
5	23
6	27
7	32
8	39
9	48
10	51
11	59
12	60
13	83
14	108
15	111
16	116
17	128
18	132
19	135
20	171
21	188
22	203
23	212
24	227
25	240
26	263
27	275
28	315
29	324
30	356
31	359
32	363
33	384
34	392
35	447
36	476
37	479
38	515
39	528
40	588
41	627
42	647
43	648
44	672
45	731
46	759
47	780
48	804
49	839
50	864
51	875
52	900
53	903
54	968
55	975