A075761 - OEIS

A075761 as a simple table

n	a(n)
1	13
2	17
3	19
4	21
5	25
6	29
7	31
8	33
9	37
10	41
11	57
12	61
13	65
14	73
15	85
16	91
17	121
18	129
19	133
20	145
21	169
22	225
23	253
24	257
25	261
26	265
27	281
28	301
29	325
30	337
31	361
32	385
33	505
34	513
35	757
36	785
37	841
38	1057
39	1081
40	1093
41	1381
42	1625
43	2080
44	2241
45	3241
46	4117
47	4377
48	4401
49	5125
50	8281
51	16416

[13,17,19,21,25,29,31,33,37,41,57,61,65,73,85,91, 121,129,133,145,169,225,253,257,261,265,281,301, 325,337,361,385,505,513,757,785,841,1057,1081, 1093,1381,1625,2080,2241,3241,4117,4377,4401,5125, 8281,16416]