Triple Product (noch nicht übersetzt)
Problem 831
Let g(m) be the integer defined by the following double sum of products of binomial coefficients:
m∑j=0j∑i=0(−1)j−i(mj)(ji)(j+5+6ij+5)
You are given that g(10)=127278262644918.
Its first (most significant) five digits are 12727.
Find the first ten digits of g(142857) when written in base 7.