A268641 - cp's OEIS frontend

A268641 Squarefree numbers k such that k^2 + 1 and k^2 - 1 are also squarefree.

n	a(n)
1	2
2	6
3	14
4	22
5	30
6	34
7	42
8	58
9	66
10	78
11	86
12	94
13	102
14	106
15	110
16	114
17	130
18	138
19	142
20	158
21	166
22	178
23	186
24	194
25	202
26	210
27	214
28	222
29	230
30	238
31	254
32	258
33	266
34	286
35	302
36	310
37	322
38	330
39	346
40	354
41	358
42	366
43	390
44	394
45	398
46	402
47	410
48	430
49	434
50	438
51	446
52	454
53	462
54	466
55	470
56	498

[2, 6, 14, 22, 30, 34, 42, 58, 66, 78, 86, 94, 102, 106, 110, 114, 130, 138, 142, 158, 166, 178, 186, 194, 202, 210, 214, 222, 230, 238, 254, 258, 266, 286, 302, 310, 322, 330, 346, 354, 358, 366, 390, 394, 398, 402, 410, 430, 434, 438, 446, 454, 462, 466, 470, 498]

cp's OEIS Frontend

A268641 Squarefree numbers k such that k^2 + 1 and k^2 - 1 are also squarefree.

Table of values

List of values

n	a(n)
1	2
2	6
3	14
4	22
5	30
6	34
7	42
8	58
9	66
10	78
11	86
12	94
13	102
14	106
15	110
16	114
17	130
18	138
19	142
20	158
21	166
22	178
23	186
24	194
25	202
26	210
27	214
28	222
29	230
30	238
31	254
32	258
33	266
34	286
35	302
36	310
37	322
38	330
39	346
40	354
41	358
42	366
43	390
44	394
45	398
46	402
47	410
48	430
49	434
50	438
51	446
52	454
53	462
54	466
55	470
56	498

n	a(n)
1	2
2	6
3	14
4	22
5	30
6	34
7	42
8	58
9	66
10	78
11	86
12	94
13	102
14	106
15	110
16	114
17	130
18	138
19	142
20	158
21	166
22	178
23	186
24	194
25	202
26	210
27	214
28	222
29	230
30	238
31	254
32	258
33	266
34	286
35	302
36	310
37	322
38	330
39	346
40	354
41	358
42	366
43	390
44	394
45	398
46	402
47	410
48	430
49	434
50	438
51	446
52	454
53	462
54	466
55	470
56	498

n	a(n)
1	2
2	6
3	14
4	22
5	30
6	34
7	42
8	58
9	66
10	78
11	86
12	94
13	102
14	106
15	110
16	114
17	130
18	138
19	142
20	158
21	166
22	178
23	186
24	194
25	202
26	210
27	214
28	222
29	230
30	238
31	254
32	258
33	266
34	286
35	302
36	310
37	322
38	330
39	346
40	354
41	358
42	366
43	390
44	394
45	398
46	402
47	410
48	430
49	434
50	438
51	446
52	454
53	462
54	466
55	470
56	498