MathDB

1

Part of 1990 Federal Competition For Advanced Students, P2

Problems(1)

determine the number of integers

Source: Austria 1990

7/10/2009
Determine the number of integers n n with 1 \le n \le N\equal{}1990^{1990} such that n^2\minus{}1 and N N are coprime.
number theoryleast common multiplenumber theory unsolved