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A061439 as a simple table

na(n)
12
24
39
421
546
699
7215
8464
9999
102154
114641
129999
1321544
1446415
1599999
16215443
17464158
18999999
192154434
204641588
219999999
2221544346
2346415888
2499999999
25215443469
26464158883
27999999999
282154434690
294641588833
309999999999

[2,4,9,21,46,99,215,464,999,2154,4641,9999,21544,
 46415,99999,215443,464158,999999,2154434,4641588,
 9999999,21544346,46415888,99999999,215443469,
 464158883,999999999,2154434690,4641588833,
 9999999999]