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A087871 as a simple table

na(n)
15
261
3181
4613
51301
61741
78581
89661
914621
1019013
1123981
1237813
1344701
1449613
1568821
1671821
1794613
18101701
19105341
20163021
21167621
22177013
23244301
24255613
25273061
26303421
27335381
28382813
29456013
30479221
31511061
32552301
33595141
34603901

[5,61,181,613,1301,1741,8581,9661,14621,19013,
 23981,37813,44701,49613,68821,71821,94613,101701,
 105341,163021,167621,177013,244301,255613,273061,
 303421,335381,382813,456013,479221,511061,552301,
 595141,603901]