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A253640 as a simple table

na(n)
17
231
31231
44231
5366031
6819031
71155631
81311031
91575031
103822031
114389031
124515631
135880631
147102231
159333031
169954031
1713213231
1813432231
1916120231
2019140631
2125654231
2234987231
2337393231
2438875231
2539375631
2641152231
2747955631
2852345231
2953655631
3062647231
3167486231

[7,31,1231,4231,366031,819031,1155631,1311031,
 1575031,3822031,4389031,4515631,5880631,7102231,
 9333031,9954031,13213231,13432231,16120231,
 19140631,25654231,34987231,37393231,38875231,
 39375631,41152231,47955631,52345231,53655631,
 62647231,67486231]