Crazy Representations of Natural Numbers1→9, 9→1 and 9→0 Generator

Digits in strict order · Every digit used exactly once
Created by Inder J. Taneja
Rules: Digits appear in exact sequence — ascending 1→9 or descending 9→1. Adjacent digits may be concatenated: 12, 345, etc. Power a^b: exponent b must be the immediately next token. Grouped power (a op b)^c: c must immediately follow the group.
+ − × ÷ ^ n! factorial √ square root
↑ Ascending 1→9 ↓ Descending 9→1 ↓ Descending 9→0
Set a range and click Generate.