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A171464 as a simple table

na(n)
00
11
22
33
47
57
67
77
811
911
1011
1111
1215
1315
1415
1515
1631
1731
1831
1931
2031
2131
2231
2331
2431
2531
2631
2731
2831
2931
3031
3131
3247
3347
3447
3547
3647
3747
3847
3947
4047
4147
4247
4347
4447
4547
4647
4747
4863
4963
5063
5163
5263
5363
5463
5563
5663
5763
5863
5963
6063
6163
6263
6363
64127
65127
66127
67127
68127
69127

[0,1,2,3,7,7,7,7,11,11,11,11,15,15,15,15,31,31,31,
 31,31,31,31,31,31,31,31,31,31,31,31,31,47,47,47,
 47,47,47,47,47,47,47,47,47,47,47,47,47,63,63,63,
 63,63,63,63,63,63,63,63,63,63,63,63,63,127,127,
 127,127,127,127]