A216566 - cp's OEIS frontend

A216566 Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + b^2.

n	a(n)
1	2
2	4
3	5
4	8
5	11
6	16
7	17
8	41
9	47
10	53
11	71
12	113
13	353
14	503
15	617
16	863
17	1097
18	1361
19	4787
20	4793
21	10691
22	12251
23	19469
24	36779
25	44507
26	56003
27	81671
28	89849
29	94823
30	140057
31	148091
32	159521
33	183089
34	202667
35	443609
36	532277
37	616787
38	631181
39	637751
40	651821
41	692147

[2, 4, 5, 8, 11, 16, 17, 41, 47, 53, 71, 113, 353, 503, 617, 863, 1097, 1361, 4787, 4793, 10691, 12251, 19469, 36779, 44507, 56003, 81671, 89849, 94823, 140057, 148091, 159521, 183089, 202667, 443609, 532277, 616787, 631181, 637751, 651821, 692147]

cp's OEIS Frontend

A216566 Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + b^2.

Table of values

List of values