Search: id:A088498
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%I A088498
%S A088498 2,5,20,455,1364,2204,2450,2729,8540,18485,32198,32318,32780,45863,
%T A088498 61214,72554,72560,82145,83258,86603,91370,95198,125333,149330,176888,
%U A088498 182909,185534,210845,225665,226253,288419,343160,350090,403940,411500
%N A088498 Numbers n such that n^2 + n - 1 and n^2 + n + 1 are twin primes and (n 
               + 1)*(n + 1) + n + 1 - 1 and (n + 1)*(n + 1) + n + 1 + 1 are also 
               twin primes.
%e A088498 20*20+20-1 =419, 419 421 twin primes and 21*21+21-1 =461, 461 463 twin 
               primes.
%t A088498 Select[ Range[510397], PrimeQ[ #^2 + # - 1] && PrimeQ[ #^2 + # + 1] && 
               PrimeQ[ #^2 + 3# + 1] && PrimeQ[ #^2 + 3# + 3] & ]
%Y A088498 Sequence in context: A158872 A006893 A003163 this_sequence A039777 A000941 
               A000131
%Y A088498 Adjacent sequences: A088495 A088496 A088497 this_sequence A088499 A088500 
               A088501
%K A088498 base,nonn
%O A088498 1,1
%A A088498 Pierre CAMI (colettecami(AT)aol.com), Nov 11 2003
%E A088498 Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net) 
               and Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 12 2003

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