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A104860 as a simple table

na(n)
15
27
311
413
517
623
729
829
937
1041
1143
1253
1359
1459
1567
1671
1779
1883
1989
2097
2197
22103
23107
24127
25127
26131
27131
28137
29139
30149
31163
32167
33173
34179
35191
36191
37197
38211
39211
40223
41223
42227
43239
44239
45251
46251
47263
48277
49277
50281

[5,7,11,13,17,23,29,29,37,41,43,53,59,59,67,71,79,
 83,89,97,97,103,107,127,127,131,131,137,139,149,
 163,167,173,179,191,191,197,211,211,223,223,227,
 239,239,251,251,263,277,277,281]