A272878 - cp's OEIS frontend

A272878 a(0) = a(1) = 1, smallest a(n+1) > a(n-1) such that a(n)^2 + a(n+1)^2 is prime.

n	a(n)
0	1
1	1
2	2
3	3
4	8
5	5
6	16
7	9
8	26
9	11
10	30
11	13
12	32
13	15
14	34
15	21
16	44
17	29
18	46
19	39
20	50
21	43
22	60
23	61
24	64
25	71
26	66
27	79
28	74
29	81
30	100
31	83
32	102
33	95
34	104
35	101
36	114
37	109
38	134
39	115
40	136
41	135
42	146
43	139
44	154
45	141
46	160
47	143
48	168
49	155
50	172
51	165
52	178
53	173
54	190
55	177
56	200
57	189
58	206
59	199

[1, 1, 2, 3, 8, 5, 16, 9, 26, 11, 30, 13, 32, 15, 34, 21, 44, 29, 46, 39, 50, 43, 60, 61, 64, 71, 66, 79, 74, 81, 100, 83, 102, 95, 104, 101, 114, 109, 134, 115, 136, 135, 146, 139, 154, 141, 160, 143, 168, 155, 172, 165, 178, 173, 190, 177, 200, 189, 206, 199]

cp's OEIS Frontend

A272878 a(0) = a(1) = 1, smallest a(n+1) > a(n-1) such that a(n)^2 + a(n+1)^2 is prime.

Table of values

List of values

n	a(n)
0	1
1	1
2	2
3	3
4	8
5	5
6	16
7	9
8	26
9	11
10	30
11	13
12	32
13	15
14	34
15	21
16	44
17	29
18	46
19	39
20	50
21	43
22	60
23	61
24	64
25	71
26	66
27	79
28	74
29	81
30	100
31	83
32	102
33	95
34	104
35	101
36	114
37	109
38	134
39	115
40	136
41	135
42	146
43	139
44	154
45	141
46	160
47	143
48	168
49	155
50	172
51	165
52	178
53	173
54	190
55	177
56	200
57	189
58	206
59	199

n	a(n)
0	1
1	1
2	2
3	3
4	8
5	5
6	16
7	9
8	26
9	11
10	30
11	13
12	32
13	15
14	34
15	21
16	44
17	29
18	46
19	39
20	50
21	43
22	60
23	61
24	64
25	71
26	66
27	79
28	74
29	81
30	100
31	83
32	102
33	95
34	104
35	101
36	114
37	109
38	134
39	115
40	136
41	135
42	146
43	139
44	154
45	141
46	160
47	143
48	168
49	155
50	172
51	165
52	178
53	173
54	190
55	177
56	200
57	189
58	206
59	199

n	a(n)
0	1
1	1
2	2
3	3
4	8
5	5
6	16
7	9
8	26
9	11
10	30
11	13
12	32
13	15
14	34
15	21
16	44
17	29
18	46
19	39
20	50
21	43
22	60
23	61
24	64
25	71
26	66
27	79
28	74
29	81
30	100
31	83
32	102
33	95
34	104
35	101
36	114
37	109
38	134
39	115
40	136
41	135
42	146
43	139
44	154
45	141
46	160
47	143
48	168
49	155
50	172
51	165
52	178
53	173
54	190
55	177
56	200
57	189
58	206
59	199