Cody

# Problem 44385. Extra safe primes

Solution 1397200

Submitted on 29 Dec 2017
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### Test Suite

Test Status Code Input and Output
1   Pass
x = 0; assert(isequal(isextrasafe(x),false))

ans = logical 0

2   Pass
x = 5; assert(isequal(isextrasafe(x),false))

ans = logical 0

3   Pass
x = 7; assert(isequal(isextrasafe(x),false))

ans = logical 0

4   Pass
x = 11; assert(isequal(isextrasafe(x),true))

ans = logical 1

5   Fail
x = 15; assert(isequal(isextrasafe(x),false))

ans = logical 1

Assertion failed.

6   Pass
x = 23; assert(isequal(isextrasafe(x),true))

ans = logical 1

7   Fail
x = 71; assert(isequal(isextrasafe(x),false))

ans = logical 1

Assertion failed.

8   Pass
x = 719; assert(isequal(isextrasafe(x),true))

ans = logical 1

9   Pass
x = 2039; assert(isequal(isextrasafe(x),true))

ans = logical 1

10   Fail
x = 2040; assert(isequal(isextrasafe(x),false))

Error using isprime (line 19) All entries of X must be nonnegative integers. Error in isextrasafe (line 2) isprime((((x-1)/2*double(x>6))-1)/2*double(x>6)) Error in Test10 (line 2) assert(isequal(isextrasafe(x),false))

11   Pass
x = 5807; assert(isequal(isextrasafe(x),true))

ans = logical 1