document.write( "Question 1143895: If a and b are prime numbers which if the following cannot be the sum of a and b?
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Algebra.Com's Answer #764830 by ikleyn(52805) $\"\"$ $\"About$

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document.write( "13 = 2 + 11.\r\n" );
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document.write( "16 = 5 + 11.\r\n" );
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document.write( "25 = 2 + 23.\r\n" );
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document.write( "27 can not be the sum of two primes, since then one of them must be even number (i.e. 2),  but 27 - 2 = 25 IS NOT a PRIME.\r\n" );
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document.write( "ANSWER.  27.\r\n" );
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