I need a function that returns the smallest prime number p smaller than 100,000 such that (p + n) is also prime, where n is a scalar integer and is the sole input argument to the function

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Octavzz
Octavzz 2015-8-26
编辑： Stephen23 2015-8-27
Write a function called prime_pairs that returns the smallest prime number p smaller than 100,000 such that (p + n) is also prime, where n is a scalar integer and is the sole input argument to the function. If no such number exists, then the function returns -1. You may use the built-in functions, primes and isprime.
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Stephen23
Stephen23 2015-8-27
编辑：Stephen23 2015-8-27
function p = prime_pairs(n)
V = primes(1e5);
V = V(isprime(n+V));
if isempty(V)
p = -1;
else
p = V(1);
end
end

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charu sharma
charu sharma 2015-8-27
For simple code refer this and ask if you have any query: http://farzicoders.blogspot.in/2015/08/write-function-called-primepairs-that.html
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Stephen23
Stephen23 2015-8-27
"simple code" with:
  • poorly named variables: for i=1:l
  • superfluous intermediate variables: flag
  • superfluous loops when code vectorization would be neater.
  • superfluous return statements.

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