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A047270 as a simple table

na(n)
13
25
39
411
515
617
721
823
927
1029
1133
1235
1339
1441
1545
1647
1751
1853
1957
2059
2163
2265
2369
2471
2575
2677
2781
2883
2987
3089
3193
3295
3399
34101
35105
36107
37111
38113
39117
40119
41123
42125
43129
44131
45135
46137
47141
48143
49147
50149

[3,5,9,11,15,17,21,23,27,29,33,35,39,41,45,47,51,
 53,57,59,63,65,69,71,75,77,81,83,87,89,93,95,99,
 101,105,107,111,113,117,119,123,125,129,131,135,
 137,141,143,147,149]