Problem C. 1255. (November 2014)
C. 1255. Determine the fourdigit number \(\displaystyle \overline{abcd}\), given that in the equation \(\displaystyle {n^4=\overline{a6b\;c4d\;641}}\) \(\displaystyle n\) denotes a positive integer with the sequence of digits increasing left to right.
(5 pont)
Deadline expired on 10 December 2014.
Statistics:
226 students sent a solution.  
5 points:  143 students. 
4 points:  51 students. 
3 points:  13 students. 
2 points:  3 students. 
1 point:  2 students. 
0 point:  3 students. 
Unfair, not evaluated:  10 solutions. 
Unfair, not evaluated:  1 solution. 
