Cody

Problem 659. How long is the longest prime diagonal?

Solution 1250973

Submitted on 14 Aug 2017 by Michelangelo Ricciulli
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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))

n = 4 lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 1 lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1

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

n = 7 lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 1 lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1

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

n = 13 lgtn = [] lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 1 lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 5 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 1

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

n = 52 lgtn = [] lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 5 lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 1 lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 5 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 6 lgtn = 0×1 empty double column vector lgtn = 5 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 6 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1

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

n = 81 lgtn = [] lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 6 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 5 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 1 lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 5 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 6 lgtn = 0×1 empty double column vector lgtn = 5 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 4 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 6 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 2 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 3 lgtn = 0×1 empty double column vector lgtn = 5 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 0×1 empty double column vector lgtn = 1 lgtn = 0×1 empty double column vector lgtn = 1

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