Tidy Numbers solutions

Tidy Numbers was solved using Scheme by 5 contestants. Solution sizes: average 908 bytes (shortest: 407; longest: 1268).

8153.

Atrus (S, L)
9640.

gwaihir (S, L) (1268 B)
10523.

thiro (S, L) (407 B)
14252.

Pla (S) (904 B)
17083.

amz3 (S) (1199 B)