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If n is a power of 10 then put it at the end, if it is a repdigit then put it before floor[n/10], otherwise put it before (n-1).
Table of n, a(n) for n=1..16.
Cf. A000422, A060555.
Sequence in context: A138793 A014925 A000422 * A057610 A036737 A141267
Adjacent sequences: A060551 A060552 A060553 * A060555 A060556 A060557
Henry Bottomley, Apr 02 2001