This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.
task←{
totient ← 1+.=⍳∨⊢
prime ← totient=-∘1
⎕←'Index' 'Totient' 'Prime',(⊢⍪totient¨,[÷2]prime¨)⍳25
{⎕←'There are' (+/prime¨⍳⍵) 'primes below' ⍵}¨100 1000 10000
}