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A068003 as a simple table

na(n)
15
257
35759
457595779
55759577957595817
657595779575958175759577957595829
75759577957595817575957795759582957595779575958175759577957595857

[5,57,5759,57595779,5759577957595817,
 57595779575958175759577957595829,
 57595779575958175759577957595829575957795759581757\
 59577957595857]