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A305007 as a simple table

na(n)
11
22
33
44
55
63
77
88
99
105
1111
123
1313
147
155
1616
1717
1818
1919
202
2121
2211
2323
246
2525
2613
2727
287
2929
305
3131
3232
3311
3417
3535
3636
3737
3819
3939
4020
4141
4221
4343
4411
4515
4623
4747
4812
4949
5050
5117
5226
5353
5427
5555
567
5757
5829
5959
601
6161
6231
6363
6464
6565
6611
6767
6834
6923
7035
7171
7272
7373
7437
7575

[1,2,3,4,5,3,7,8,9,5,11,3,13,7,5,16,17,18,19,2,21,
 11,23,6,25,13,27,7,29,5,31,32,11,17,35,36,37,19,
 39,20,41,21,43,11,15,23,47,12,49,50,17,26,53,27,
 55,7,57,29,59,1,61,31,63,64,65,11,67,34,23,35,71,
 72,73,37,75]