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Palindromic and prime (Posted on 2013-12-30) Difficulty: 3 of 5
For what values of x the expression 2x^2+2x+1 is palindromic and prime?

x=1 is the 1st answer.

Please provide three others.

  Submitted by Ady TZIDON    
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Solution: (Hide)
x such that x^2+(x+1)^2 is palindromic and prime:
1,5,12,1262.
None others were found below 20,000,000,000
.

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  Subject Author Date
Solutioncomputer solutionCharlie2013-12-30 17:45:16
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