Across: A: the square of the reverse of L across.
G: To get G across, subtract 1 from D down and multiply the result with 2
H: A power of 2
I: three times D down
J: the digit product of J across is a square number.
L: the digit product of L across equals H across.
M: multiply the reverse of J across with the digit product of C down to get M across.
N: C down to the third.
Down: A: A palindrome.
B: I across squared.
C: a prime number.
D: the reverse of a prime number.
E: A down - B down
F: A across - N across
K: The digit product of K down equals H across.
L: The sum of L down's digits is a power of 2.