The number 139854276 contains all the digits from 1 to 9, and is a perfect square:
What other nine-digit numbers, with all their digits different, are squares? (The use of a computer is NOT regarded as cheating to solve this problem!)
Answer: There are 30 different nine-digit squares containing all the digits from 1 to 9, starting with 118262 = 139854276 and ending with 303842 = 923187456.
- Pieter Holtzhausen of Hoërskool Stellenbosch wins a R20 prize voucher for his solution using a program written in Turbo Pascal