... an even number with an odd number of letters? 
... a square number with a prime number of letters? 
... a cube number with a triangular number of letters? 
... an odd number with an even number of letters? 
... a prime number with a square number of letters? 
... a triangular number with a cube number of letters? 
Extension: Which numbers have the same number of letters as their value? 
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... an even number with an odd number of letters? 2 
... a square number with a prime number of letters? 1 
... a cube number with a triangular number of letters? 1 
... an odd number with an even number of letters? 5 
... a prime number with a square number of letters? 5 
... a triangular number with a cube number of letters? 66 
The answer to the extension is only 4.
What about other languages.
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