# APL Hacking: Project Euler (#29)

Problem #29:

Another easy one. I think they are going soft on me. Or maybe they are just doing problems for which APL seems to be designed.

∇Z←PETWENTYNINE;⎕IO ⎕IO←1 ⍝ Compute the cardinality of the set ⍝ {a*b | 2≤a≤100 ^ 2≤b≤100} ⍝ Easy to do by computing the sequence, ⍝ ordering it, and then removing duplicates. Z←⍴(-1⌽1↓(Z≠-1⌽Z),1)/Z←Z[⍋Z←,(1↓⍳100)∘.*(1↓⍳100)] ∇

Another easy one. I think they are going soft on me. Or maybe they are just doing problems for which APL seems to be designed.