Cody

# Problem 44385. Extra safe primes

Solution 1461292

Submitted on 12 Mar 2018
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### Test Suite

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

Error using isprime (line 19) All entries of X must be nonnegative integers. Error in isextrasafe (line 3) all(isprime([ans (ans-1)/2])); Error in Test1 (line 2) assert(isequal(isextrasafe(x),false))

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

Error using isprime (line 19) All entries of X must be nonnegative integers. Error in isextrasafe (line 3) all(isprime([ans (ans-1)/2])); Error in Test2 (line 2) assert(isequal(isextrasafe(x),false))

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

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

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

Assertion failed.

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

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

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

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

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 3) all(isprime([ans (ans-1)/2])); Error in Test10 (line 2) assert(isequal(isextrasafe(x),false))

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