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T=[1,1,1,1,2] P=[2,3,5,7,11,13] def NP(N): global P if P[-1]<=N: for n in range(P[-1]+2,N+1,2): isP=True i=1 while P[i]**2<=n: if n%P[i]==0: isP=False break i+=1 if isP : P.append(n) return len(P) for i in range(len(P)): if P[i]>N: return i def redJohn(n): global T for _ in range(n+1-len(T)): T.append(T[-1]+T[-4]) return NP(T[n])

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## Red John is Back

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