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A378964 a(n) is the least prime of the form p^2 + n*q^2 where p and q are primes, or -1 if there are none.

Table of values

n a(n)
1 13
2 17
3 31
4 41
5 29
6 73
7 37
8 41
9 61
10 89
11 53
12 73
13 61
14 151
15 109
16 73
17 157
18 97
19 101
20 89
21 109
22 97
23 101
24 241
25 109
26 113
27 157
28 137
29 -1
30 241
31 149
32 137
33 157
34 257
35 149
36 193
37 157
38 367
39 181
40 281
41 173
42 193
43 181
44 421
45 229
46 193
47 197
48 241
49 317
50 499
51 229
52 233
53 -1
54 241
55 229
56 233
57 277
58 241
59 -1
60 409
61 269
62 257
63 277

List of values

[13, 17, 31, 41, 29, 73, 37, 41, 61, 89, 53, 73, 61, 151, 109, 73, 157, 97, 101, 89, 109, 97, 101, 241, 109, 113, 157, 137, -1, 241, 149, 137, 157, 257, 149, 193, 157, 367, 181, 281, 173, 193, 181, 421, 229, 193, 197, 241, 317, 499, 229, 233, -1, 241, 229, 233, 277, 241, -1, 409, 269, 257, 277]