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A228498 as a simple table

na(n)
10
21
31
47
51
631
71
831
913
1057
111
12163
131
1491
1573
16127
171
18307
191
20321
21111
22183
231
24691
2531
26241
27121
28535
291
301261
311
32511
33211
34381
35157
361591
371
38463
39273
401377
411
422163
431
441131
45781
46651
471
482803
4957
501467
51421
521513
531
542791
55273
562311
57507
58993
591
606253
611
621123
631227
642047
65343
664711
671
682445
69703

[0,1,1,7,1,31,1,31,13,57,1,163,1,91,73,127,1,307,
 1,321,111,183,1,691,31,241,121,535,1,1261,1,511,
 211,381,157,1591,1,463,273,1377,1,2163,1,1131,781,
 651,1,2803,57,1467,421,1513,1,2791,273,2311,507,
 993,1,6253,1,1123,1227,2047,343,4711,1,2445,703]