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A206553 as a simple table

na(n)
15
25
313
47
55
65
77
87
911
1013
1113
1211
135
1411
1537
1611
175
1823
1913
2047
2189
2213
2319
2419
2511
267
2719
2823
2917
3013
3119
3243
3329
3479
3561
3617
37191
3843
39337
4053
4129
4217
4313
4413
4529
4611
4719
4811
4911
5013
5143
52163
5329
5413
557
5653
5723
5897
5931
6029
6141
6283
6379
6423
65191
6697

[5,5,13,7,5,5,7,7,11,13,13,11,5,11,37,11,5,23,13,
 47,89,13,19,19,11,7,19,23,17,13,19,43,29,79,61,17,
 191,43,337,53,29,17,13,13,29,11,19,11,11,13,43,
 163,29,13,7,53,23,97,31,29,41,83,79,23,191,97]