(pp-1)/2 is prime: {27, 2187,...}

[ZAKIRS]

with my misery "database" of 1111 perfect primes < 1,000,000
i've found only two pp: {27, 2187} such that (pp-1)/2 is prime.
 
can anybody provide me next 1000 pp's and/or find several next pp's in
subject. thanks, zak

 

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