A215937 - cp's OEIS frontend

A215937 Numbers n such that 2^n + 1 can be written in the form a^2 + 5*b^2.

n	a(n)
1	2
2	3
3	7
4	10
5	11
6	19
7	23
8	31
9	43
10	47
11	50
12	58
13	71
14	79
15	82
16	107
17	127
18	167
19	178
20	179
21	191
22	199
23	250
24	290
25	298
26	311
27	347
28	359
29	410
30	487
31	563
32	599
33	683
34	751
35	802
36	890
37	907
38	1051

[2, 3, 7, 10, 11, 19, 23, 31, 43, 47, 50, 58, 71, 79, 82, 107, 127, 167, 178, 179, 191, 199, 250, 290, 298, 311, 347, 359, 410, 487, 563, 599, 683, 751, 802, 890, 907, 1051]

cp's OEIS Frontend

A215937 Numbers n such that 2^n + 1 can be written in the form a^2 + 5*b^2.

Table of values

List of values