A105173 - cp's OEIS frontend

A105173 Numbers k such that either k(k+1)/4 + 1 or k(k+1)/4 - 1 or both are primes.

n	a(n)
1	3
2	7
3	8
4	15
5	16
6	23
7	24
8	32
9	39
10	40
11	47
12	48
13	55
14	56
15	63
16	64
17	71
18	79
19	80
20	87
21	95
22	103
23	104
24	111
25	112
26	119
27	120
28	128
29	135
30	136
31	143
32	151
33	152
34	159
35	167
36	175
37	176
38	183
39	199
40	208
41	216
42	223
43	224
44	231
45	232
46	239
47	240
48	247
49	248
50	255
51	256
52	263
53	264
54	271
55	279
56	287
57	288

[3, 7, 8, 15, 16, 23, 24, 32, 39, 40, 47, 48, 55, 56, 63, 64, 71, 79, 80, 87, 95, 103, 104, 111, 112, 119, 120, 128, 135, 136, 143, 151, 152, 159, 167, 175, 176, 183, 199, 208, 216, 223, 224, 231, 232, 239, 240, 247, 248, 255, 256, 263, 264, 271, 279, 287, 288]

cp's OEIS Frontend

A105173 Numbers k such that either k(k+1)/4 + 1 or k(k+1)/4 - 1 or both are primes.

Table of values

List of values

n	a(n)
1	3
2	7
3	8
4	15
5	16
6	23
7	24
8	32
9	39
10	40
11	47
12	48
13	55
14	56
15	63
16	64
17	71
18	79
19	80
20	87
21	95
22	103
23	104
24	111
25	112
26	119
27	120
28	128
29	135
30	136
31	143
32	151
33	152
34	159
35	167
36	175
37	176
38	183
39	199
40	208
41	216
42	223
43	224
44	231
45	232
46	239
47	240
48	247
49	248
50	255
51	256
52	263
53	264
54	271
55	279
56	287
57	288

n	a(n)
1	3
2	7
3	8
4	15
5	16
6	23
7	24
8	32
9	39
10	40
11	47
12	48
13	55
14	56
15	63
16	64
17	71
18	79
19	80
20	87
21	95
22	103
23	104
24	111
25	112
26	119
27	120
28	128
29	135
30	136
31	143
32	151
33	152
34	159
35	167
36	175
37	176
38	183
39	199
40	208
41	216
42	223
43	224
44	231
45	232
46	239
47	240
48	247
49	248
50	255
51	256
52	263
53	264
54	271
55	279
56	287
57	288

cp's OEIS Frontend

A105173 Numbers k such that either k*(k+1)/4 + 1 or k*(k+1)/4 - 1 or both are primes.

Table of values

List of values

A105173 Numbers k such that either k(k+1)/4 + 1 or k(k+1)/4 - 1 or both are primes.

n	a(n)
1	3
2	7
3	8
4	15
5	16
6	23
7	24
8	32
9	39
10	40
11	47
12	48
13	55
14	56
15	63
16	64
17	71
18	79
19	80
20	87
21	95
22	103
23	104
24	111
25	112
26	119
27	120
28	128
29	135
30	136
31	143
32	151
33	152
34	159
35	167
36	175
37	176
38	183
39	199
40	208
41	216
42	223
43	224
44	231
45	232
46	239
47	240
48	247
49	248
50	255
51	256
52	263
53	264
54	271
55	279
56	287
57	288