Problem 659. How long is the longest prime diagonal?

Solution 179203

Submitted on 19 Dec 2012 by Des Mc Manus

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Test	Status	Code Input and Output
1	Pass	%% n = 4; d = 2; %p = isprime(spiral(n));imagesc(p) assert(isequal(prime_spiral(n),d)) max1 = 2 max2 = 2 d = 2
2	Pass	%% n = 7; d = 4; assert(isequal(prime_spiral(n),d)) max1 = 3 max2 = 4 d = 4
3	Pass	%% n = 13; d = 5; assert(isequal(prime_spiral(n),d)) max1 = 5 max2 = 5 d = 5
4	Pass	%% n = 52; d = 6; assert(isequal(prime_spiral(n),d)) max1 = 5 max2 = 6 d = 6
5	Pass	%% n = 81; d = 9; assert(isequal(prime_spiral(n),d)) max1 = 9 max2 = 6 d = 9