Numbers n such that the decimal concatenations 1n and 2n are both squares.

A272672

Numbers n such that the decimal concatenations 1n and 2n are both squares.

Terms

    a(0) =1025a(1) =102500a(2) =1390625a(3) =10250000a(4) =96700625a(5) =139062500a(6) =1025000000a(7) =9670062500a(8) =13906250000a(9) =102500000000a(10) =967006250000

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