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A031778 as a simple table

na(n)
12501
210002
322503
440004
562505
690006
7122507
8160008
9202509
10250010
11302511
12360012
13422513
14490014
15562515
16640016
17722517
18810018
19902519
201000020
211102521
221210022
231322523
241440024
251562525
261690026
271822527
281960028
292102529
302250030

[2501,10002,22503,40004,62505,90006,122507,160008,
 202509,250010,302511,360012,422513,490014,562515,
 640016,722517,810018,902519,1000020,1102521,
 1210022,1322523,1440024,1562525,1690026,1822527,
 1960028,2102529,2250030]