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A164808 as a simple table

na(n)
1-1
20
33
411
57
615
714
817
923
1017
1127
1243
1337
1447
1557
16117
17127
18143
19137
20147
21157
22243
23237
24247
25257
26357
27447
28457

[-1,0,3,11,7,15,14,17,23,17,27,43,37,47,57,117,
 127,143,137,147,157,243,237,247,257,357,447,457]