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A103913
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Numbers n such that 2*P(n)+1, 2*P(n+1)+1, 2*P(n+2)-3, 2*P(n+3)+3 are also consecutive primes with P(i)=i-th prime.
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2
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OFFSET
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1,1
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LINKS
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PROG
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(PARI) isok(n) = {my(p=2*prime(n)+1, q=2*prime(n+1)+1, r=2*prime(n+2)-3, s=2*prime(n+3)+3); isprime(p) && (nextprime(p+1) == q) && (nextprime(q+1) == r) && (nextprime(r+1) == s); } \\ Michel Marcus, Sep 24 2019
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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