**Across**

**B**: the digit product of G across minus one.

**E**: a palindrome and prime number.

**F**: a prime number.

**G**: A prime numbe.

**H**: F across - B across.

**I**: I across divided by the digit sum of E across equals the digit sum of B down plus the digit sum of C down.

**J**: a cubic number.

**K**: A prime number.

**L**: K across multiplied with the digit sum of J across.

**Down**

**A**: A down has the same digit sum as B down, and A down equals H across squared.

**B**: E across squared.

**C**: G across squared.

**D**: F across squared.