Posted by: Debonair August 21, 2008
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If 1 is not considered Prime number, then there is no solution to the question
because there are only 4 prime numbers with single digit (2, 3, 5 and 7)
and one of the condition is:
"Each successive pair of digits forms a 2-digit number that is NOT a prime number", so prime number with 2-digits can't used at all.