Cody

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

Solution 1192965

Submitted on 19 May 2017 by Thorsten Bartel
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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))

v = 1×14 cell array [] [] [] [] [] [] [] [] [] [] [] [] [] []

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

v = 1×26 cell array [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] []

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

v = 1×50 cell array Columns 1 through 29 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 30 through 50 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] []

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

v = 1×206 cell array Columns 1 through 29 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 30 through 58 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 59 through 87 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 88 through 116 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 117 through 145 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 146 through 174 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 175 through 203 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 204 through 206 [] [] []

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

v = 1×322 cell array Columns 1 through 29 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 30 through 58 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 59 through 87 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 88 through 116 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 117 through 145 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 146 through 174 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 175 through 203 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 204 through 232 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 233 through 261 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 262 through 290 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 291 through 319 [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] [] Columns 320 through 322 [] [] []

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