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A082780 as a simple table

na(n)
15
255
35005
4505505
55005005005
650055055055005
750005050055005050005
85000005005005005005005000005
950000050055050055055055005055005000005

[5,55,5005,505505,5005005005,50055055055005,
 50005050055005050005,5000005005005005005005000005,
 50000050055050055055055005055005000005]