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A115739 as a simple table

na(n)
15
2251
3499
4751
51249
64999
78089
818229
931249
1049999
11281249
124218751
134999999
149590417
1531622777
1668171507
1774218751
18574218751
195740883989
208829261293

[5,251,499,751,1249,4999,8089,18229,31249,49999,
 281249,4218751,4999999,9590417,31622777,68171507,
 74218751,574218751,5740883989,8829261293]