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A217587 as a simple table

na(n)
1421
22521
33361
44201
54621
65881
76301
87561
98821
109241
119661
1210501
1312601
1413441
1514281
1615121
1715541
1816381
1918061
2018481
2120161
2221001
2321841
2424781
2525621
2626041
2726881
2829401
2930241
3030661
3131081
3232341
3333181
3433601
3535281
3636541
3739901
3841161

[421,2521,3361,4201,4621,5881,6301,7561,8821,9241,
 9661,10501,12601,13441,14281,15121,15541,16381,
 18061,18481,20161,21001,21841,24781,25621,26041,
 26881,29401,30241,30661,31081,32341,33181,33601,
 35281,36541,39901,41161]