0,2

a(5) = 102030405 =510152025/5, where 510152025 is obtained by concatenating 5,10,15,20 and finally 25 (which is 5^2).

A053062.

Sequence in context: A117640 A074158 A071269 this_sequence A125424 A120918 A039680

Adjacent sequences: A061085 A061086 A061087 this_sequence A061089 A061090 A061091

nonn,base

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 19 2001