A281505 - cp's OEIS frontend

A281505 Numbers of the form y^2 - x^2 such that x^2 + y^2 is a prime and 0 < x < y.

n	a(n)
1	3
2	5
3	9
4	11
5	15
6	19
7	21
8	25
9	29
10	35
11	39
12	45
13	49
14	51
15	55
16	59
17	61
18	65
19	69
20	71
21	75
22	79
23	85
24	91
25	95
26	99
27	101
28	105
29	115
30	121
31	129
32	131
33	139
34	141
35	145
36	159
37	165
38	169
39	171
40	175
41	181
42	189
43	195
44	199
45	201
46	205
47	209
48	215
49	219
50	221

[3, 5, 9, 11, 15, 19, 21, 25, 29, 35, 39, 45, 49, 51, 55, 59, 61, 65, 69, 71, 75, 79, 85, 91, 95, 99, 101, 105, 115, 121, 129, 131, 139, 141, 145, 159, 165, 169, 171, 175, 181, 189, 195, 199, 201, 205, 209, 215, 219, 221]

cp's OEIS Frontend

A281505 Numbers of the form y^2 - x^2 such that x^2 + y^2 is a prime and 0 < x < y.

Table of values

List of values

n	a(n)
1	3
2	5
3	9
4	11
5	15
6	19
7	21
8	25
9	29
10	35
11	39
12	45
13	49
14	51
15	55
16	59
17	61
18	65
19	69
20	71
21	75
22	79
23	85
24	91
25	95
26	99
27	101
28	105
29	115
30	121
31	129
32	131
33	139
34	141
35	145
36	159
37	165
38	169
39	171
40	175
41	181
42	189
43	195
44	199
45	201
46	205
47	209
48	215
49	219
50	221

n	a(n)
1	3
2	5
3	9
4	11
5	15
6	19
7	21
8	25
9	29
10	35
11	39
12	45
13	49
14	51
15	55
16	59
17	61
18	65
19	69
20	71
21	75
22	79
23	85
24	91
25	95
26	99
27	101
28	105
29	115
30	121
31	129
32	131
33	139
34	141
35	145
36	159
37	165
38	169
39	171
40	175
41	181
42	189
43	195
44	199
45	201
46	205
47	209
48	215
49	219
50	221

n	a(n)
1	3
2	5
3	9
4	11
5	15
6	19
7	21
8	25
9	29
10	35
11	39
12	45
13	49
14	51
15	55
16	59
17	61
18	65
19	69
20	71
21	75
22	79
23	85
24	91
25	95
26	99
27	101
28	105
29	115
30	121
31	129
32	131
33	139
34	141
35	145
36	159
37	165
38	169
39	171
40	175
41	181
42	189
43	195
44	199
45	201
46	205
47	209
48	215
49	219
50	221