A182438 - cp's OEIS frontend

A182438 Numbers n such that neither n^2+n-1 nor n^2-n-1 is prime.

n	a(n)
1	1
2	18
3	23
4	33
5	34
6	37
7	43
8	52
9	58
10	62
11	63
12	72
13	73
14	74
15	75
16	78
17	79
18	80
19	81
20	82
21	88
22	91
23	92
24	98
25	99
26	105
27	106
28	107
29	108
30	109
31	110
32	111
33	112
34	113
35	117
36	118
37	119
38	122
39	123
40	124
41	128
42	129
43	133
44	136
45	137
46	143
47	147
48	151
49	152
50	157
51	162
52	166
53	167
54	168
55	173

[1, 18, 23, 33, 34, 37, 43, 52, 58, 62, 63, 72, 73, 74, 75, 78, 79, 80, 81, 82, 88, 91, 92, 98, 99, 105, 106, 107, 108, 109, 110, 111, 112, 113, 117, 118, 119, 122, 123, 124, 128, 129, 133, 136, 137, 143, 147, 151, 152, 157, 162, 166, 167, 168, 173]

cp's OEIS Frontend

A182438 Numbers n such that neither n^2+n-1 nor n^2-n-1 is prime.

Table of values

List of values

n	a(n)
1	1
2	18
3	23
4	33
5	34
6	37
7	43
8	52
9	58
10	62
11	63
12	72
13	73
14	74
15	75
16	78
17	79
18	80
19	81
20	82
21	88
22	91
23	92
24	98
25	99
26	105
27	106
28	107
29	108
30	109
31	110
32	111
33	112
34	113
35	117
36	118
37	119
38	122
39	123
40	124
41	128
42	129
43	133
44	136
45	137
46	143
47	147
48	151
49	152
50	157
51	162
52	166
53	167
54	168
55	173

n	a(n)
1	1
2	18
3	23
4	33
5	34
6	37
7	43
8	52
9	58
10	62
11	63
12	72
13	73
14	74
15	75
16	78
17	79
18	80
19	81
20	82
21	88
22	91
23	92
24	98
25	99
26	105
27	106
28	107
29	108
30	109
31	110
32	111
33	112
34	113
35	117
36	118
37	119
38	122
39	123
40	124
41	128
42	129
43	133
44	136
45	137
46	143
47	147
48	151
49	152
50	157
51	162
52	166
53	167
54	168
55	173

n	a(n)
1	1
2	18
3	23
4	33
5	34
6	37
7	43
8	52
9	58
10	62
11	63
12	72
13	73
14	74
15	75
16	78
17	79
18	80
19	81
20	82
21	88
22	91
23	92
24	98
25	99
26	105
27	106
28	107
29	108
30	109
31	110
32	111
33	112
34	113
35	117
36	118
37	119
38	122
39	123
40	124
41	128
42	129
43	133
44	136
45	137
46	143
47	147
48	151
49	152
50	157
51	162
52	166
53	167
54	168
55	173