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| Palindromic and prime (Posted on 2013-12-30) |
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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.
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Submitted by Ady TZIDON
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Solution:
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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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