A217448 - cp's OEIS frontend

A217448 Least k > 0 such that 1 + n^2 and 1 + (n+k)^2 have the same smallest prime factor.

n	a(n)
1	2
2	6
3	2
4	26
5	2
6	74
7	2
8	4
9	2
10	404
11	2
12	6
13	2
14	366
15	2
16	514
17	2
18	4
19	2
20	1564
21	2
22	6
23	2
24	1106
25	2
26	4010
27	2
28	4
29	2
30	34
31	2
32	6
33	2
34	10
35	2
36	2594
37	2
38	4
39	2
40	22334
41	2
42	6
43	2
44	16
45	2
46	58
47	2
48	4
49	2
50	64
51	2
52	6
53	2
54	29062
55	2
56	18710
57	2
58	4
59	2
60	10
61	2
62	6
63	2
64	42
65	2
66	17428
67	2
68	4
69	2
70	16
71	2
72	6

[2, 6, 2, 26, 2, 74, 2, 4, 2, 404, 2, 6, 2, 366, 2, 514, 2, 4, 2, 1564, 2, 6, 2, 1106, 2, 4010, 2, 4, 2, 34, 2, 6, 2, 10, 2, 2594, 2, 4, 2, 22334, 2, 6, 2, 16, 2, 58, 2, 4, 2, 64, 2, 6, 2, 29062, 2, 18710, 2, 4, 2, 10, 2, 6, 2, 42, 2, 17428, 2, 4, 2, 16, 2, 6]

cp's OEIS Frontend

A217448 Least k > 0 such that 1 + n^2 and 1 + (n+k)^2 have the same smallest prime factor.

Table of values

List of values