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A137947 as a simple table

na(n)
13
213
313
413
513
613
713
813
9121
10121
11121
12121
13985
1410489
1510489
1610489
1710489
1810489
1910489
2010489
2110489
2210489
2310489
2410489
2510489
2610489
2710489
2810489
2910489
3010489
3110489
3210489

[3,13,13,13,13,13,13,13,121,121,121,121,985,10489,
 10489,10489,10489,10489,10489,10489,10489,10489,
 10489,10489,10489,10489,10489,10489,10489,10489,
 10489,10489]