Take the 2-minute tour ×
MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required.

One notices that $5^2=4!+1$, $11^2=5!+1$, and $71^2=7!+1$. Are there others?

share|improve this question
9  
This is known as Brocard's problem en.wikipedia.org/wiki/Brocard%27s_problem and is unsolved still –  Aleks Vlasev Nov 9 '11 at 9:00
2  
@Aleks: If you post this as an answer, I will accept it. –  John Bentin Nov 9 '11 at 10:39
add comment

closed as off topic by Felipe Voloch, Andrew Stacey, John Bentin, Gjergji Zaimi, Emil Jeřábek Nov 9 '11 at 18:20

Questions on MathOverflow are expected to relate to research level mathematics within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

Browse other questions tagged or ask your own question.