Problem 659. How long is the longest prime diagonal?

Solution 1967658

Submitted on 8 Oct 2019 by Earnest

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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))
2	Pass	n = 7; d = 4; assert(isequal(prime_spiral(n),d))
3	Pass	n = 13; d = 5; assert(isequal(prime_spiral(n),d))
4	Pass	n = 52; d = 6; assert(isequal(prime_spiral(n),d))
5	Pass	n = 81; d = 9; assert(isequal(prime_spiral(n),d))