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#include <iostream> using namespace std; bool prim(int n) { int ok=1; for(int i = 2 ; i*i <= n&&ok==1;i++){ if(n%i==0){ ok = 0; } } return ok==1; } int i_prim(int n) { int p1= n, p2=n; while(!prim(p1)){ p1--; } while(!prim(p2)){ p2++; } return p2-p1; }
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