Cody

Problem 659. How long is the longest prime diagonal?

Solution 593819

Submitted on 9 Mar 2015 by Guus Winter
This solution is locked. To view this solution, you need to provide a solution of the same size or smaller.
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Test Suite

Test Status Code Input and Output
1   Pass
%% n = 4; d = 2; %p = isprime(spiral(n));imagesc(p) assert(isequal(prime_spiral(n),d))

ans = 1 0 0 0 0 0 1 1 1 0 1 0 0 0 0 1

2   Pass
%% n = 7; d = 4; assert(isequal(prime_spiral(n),d))

ans = 1 0 0 0 1 0 0 0 0 0 1 0 0 0 1 0 1 0 0 0 0 0 1 0 0 1 1 0 0 0 1 0 1 0 1 0 1 0 0 0 1 0 1 0 0 0 0 0 1

3   Pass
%% n = 13; d = 5; assert(isequal(prime_spiral(n),d))

ans = 1 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 1 0 1 0 0 0 0 0 0 0 1 0 0 0 1 0 0 1 1 0 1 0 1 0 0 0 0 0 1 0 1 0 1 0 0 0 1 0 1 0 1 0 0 0 1 0 0 0 0 0 1 0 1 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 1 0 1 0 0 0 1 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0

4   Pass
%% n = 52; d = 6; assert(isequal(prime_spiral(n),d))

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5   Pass
%% n = 81; d = 9; assert(isequal(prime_spiral(n),d))

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