A B C D E F
G H I
J K L M
N O P
Q R
S T U V W
X Y Z A'
B' C' D' E'
F'

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Copyright © 2002 by Rainer Typke
No zeros occur in this puzzle.
Across : A : None of the digits in A across occurs twice in A across.
G : F' across / T down
H : The reverse of F down
J : This prime number has the same digit sum as U down.
K : All digits of K across are different and a multiple of 3. Also, K across equals P down multiplied with the digit sum of N across.
M : M across equals J across - 1, and the reverse of M across equals U down - 1.
N : A palindrome
P : N across multiplied with the digit sum of Q across
Q : This palindrome and prime number is a divisor of A down.
R : A prime number whose reverse is also a prime number
S : A square number
V : A palindrome and prime number
X : A prime number
Y : This palindrome equals N across multiplied with the square root of U down.
A' : Z down divided by the digit product of A' across is a square number.
B' : This square number has the same digit sum as W down.
D' : A prime number
F' : F' across equals the sum of G down and A across, and F' across is a multiple of T down.
Down : A : A palindrome and cubic number
B : A prime number
C : P across multiplied with the digit sum of N across
D : A palindrome and prime number
E : The reverse of M across
F : Twice I down divided by D' across. Also, the digit sum of F down equals the reverse of R across.
G : This square number equals S across multiplied with B' across.
I : I down has the same digit sum as F' across.
L : The reverse of L down is prime, and L down equals the digit product of A' across.
O : The digit product of O down is a square number.
P : R across multiplied with the digit sum of N across.
T : T down divided by X across equals the reverse of U down.
U : A square number
W : W down divided by O down equals A' across.
Y : Every digit except the first one equals the previous digit plus one.
Z : Z down equals 2 to the power of the digit sum of S across.
C' : A prime number
E' : This prime number is a divisor of I down.