Cody

# Problem 659. How long is the longest prime diagonal?

Solution 1313923

Submitted on 25 Oct 2017 by Eric G.
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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))

[Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] v1 = 2 [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] v2 = 2 d = 2

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

[Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] v1 = 3 [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] v2 = 4 d = 4

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

[Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] v1 = 5 [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] v2 = 5 d = 5

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

[Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] v1 = 5 [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] v2 = 6 d = 6

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

[Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] v1 = 9 [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] [Warning: First element of input column does not match first element of input row. Column wins diagonal conflict.] v2 = 6 d = 9