login

A253071 as a simple table

na(n)
01
17
27
321
47
549
621
795
87
949
1049
11147
1221
13147
1495
15333
167
1749
1849
19147
2049
21343
22147
23665
2421
25147
26147
27441
2895
29665
30333
311319
327
3349
3449
35147
3649
37343
38147
39665
4049
41343
42343
431029
44147
451029
46665
472331
4821
49147
50147
51441
52147
531029
54441
551995
5695
57665
58665
591995
60333
612331
621319
634837

[1,7,7,21,7,49,21,95,7,49,49,147,21,147,95,333,7,
 49,49,147,49,343,147,665,21,147,147,441,95,665,
 333,1319,7,49,49,147,49,343,147,665,49,343,343,
 1029,147,1029,665,2331,21,147,147,441,147,1029,
 441,1995,95,665,665,1995,333,2331,1319,4837]