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 # project euler 49
 # pervasive primality
 IsPrime ← =1/+≠1°/×
 S ← (
   ⍜-⇡1000 10000
   +¤×⇡3:
   ▽⊸(/↧IsPrime⍉)
   ▽⊸(↧⊃(
       ≡/↧≡₁(=4⧻◴)
     | ≡(=4⧻◴/⊂)
     )⊥10)
 )
 ∩⌞▽⊸(⊸≡◇(>0⧻)⍚S) +1⇡4500