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A257311 as a simple table

na(n)
14
25
315
49
521
67
749
863
933
1039
1113
1291
13105
1425
1545
1655
1775
1869
1981
2099
21111
22129
2343
24559
25169
26195
2785
28115
29165
30141
31153
32159
33183
3461
35549
36201
37213
38225
39175
40133
4119
42285
43231
44243
45273
46259
47315
48235
49265
50295
51355
52375
53279
5431
55403
56351
57309
58103

[4,5,15,9,21,7,49,63,33,39,13,91,105,25,45,55,75,
 69,81,99,111,129,43,559,169,195,85,115,165,141,
 153,159,183,61,549,201,213,225,175,133,19,285,231,
 243,273,259,315,235,265,295,355,375,279,31,403,
 351,309,103]