Problem 1394. Prime Ladders

Solution 231158

Submitted on 16 Apr 2013 by Jean-Marie Sainthillier

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Test	Status	Code Input and Output
1	Pass	%% p1 = 13; p2 = 29; ladder = prime_ladder(p1,p2); assert(all(isprime(ladder))) assert(iscolumn(ladder)) assert(ladder(1)==p1) assert(ladder(end)==p2) assert(all(sum(diff(num2str(ladder))~=0,2)==1))
2	Pass	%% p1 = 389; p2 = 269; ladder = prime_ladder(p1,p2); assert(all(isprime(ladder))) assert(iscolumn(ladder)) assert(ladder(1)==p1) assert(ladder(end)==p2) assert(all(sum(diff(num2str(ladder))~=0,2)==1))
3	Pass	%% p1 = 761; p2 = 397; ladder = prime_ladder(p1,p2); assert(all(isprime(ladder))) assert(iscolumn(ladder)) assert(ladder(1)==p1) assert(ladder(end)==p2) assert(all(sum(diff(num2str(ladder))~=0,2)==1))
4	Pass	%% p1 = 983; p2 = 239; ladder = prime_ladder(p1,p2); assert(all(isprime(ladder))) assert(iscolumn(ladder)) assert(ladder(1)==p1) assert(ladder(end)==p2) assert(all(sum(diff(num2str(ladder))~=0,2)==1))
5	Pass	%% p1 = 271; p2 = 439; ladder = prime_ladder(p1,p2); assert(all(isprime(ladder))) assert(iscolumn(ladder)) assert(ladder(1)==p1) assert(ladder(end)==p2) assert(all(sum(diff(num2str(ladder))~=0,2)==1))
6	Pass	%% p1 = 877; p2 = 733; ladder = prime_ladder(p1,p2); assert(all(isprime(ladder))) assert(iscolumn(ladder)) assert(ladder(1)==p1) assert(ladder(end)==p2) assert(all(sum(diff(num2str(ladder))~=0,2)==1))
7	Pass	%% p1 = 2267; p2 = 1153; ladder = prime_ladder(p1,p2); assert(all(isprime(ladder))) assert(iscolumn(ladder)) assert(ladder(1)==p1) assert(ladder(end)==p2) assert(all(sum(diff(num2str(ladder))~=0,2)==1))