Ivan has a white chessboard with a side of N unit squares, whose diagonal (a1, b2, c3, ...) is painted black. How many are the composite squares (i.e. the squares with a side of C unit squares, where 1<C<N), whose vertex unit squares are all white?
PS
Fausto Morales found the following formula
(2N^3 - 9N^2 + 10N)/6 - [1 - (-1)^N)]/4
and I'll write something similar to the (virtual) inscription on Carnegie's tombstone, namely
Here blogs a man who knows how to attract readers cleverer than himself.
PS
Fausto Morales found the following formula
(2N^3 - 9N^2 + 10N)/6 - [1 - (-1)^N)]/4
and I'll write something similar to the (virtual) inscription on Carnegie's tombstone, namely
Here blogs a man who knows how to attract readers cleverer than himself.
RSS Feed
