%I A090697
%S A090697 4,6,8,12,14,16,20,22,26,30,34,36,42,44,48,50,56,68,72,76,78,82,84,86,
%T A090697 90,92,98,100,104,112,118,124,126,128,138,146,152,160,162,170,174,182,
%U A090697 184,190,196,204,216,218,224,226,230,236,250,252,254,264,268,274,280
%N A090697 Numbers n such that n^2/2 - 1 is a prime.
%C A090697 A066436 gives resulting primes p such that 2p+2 is square. - Chandler
%D A090697 M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, 
               Bologna 1988
%D A090697 Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, 
               CittaStudiEdizioni, Milano 1997
%F A090697 a(n) = 2*A066049(n) = A110558(n)/2. - Chandler
%Y A090697 Cf. A066049, A066436, A091176, A110558.
%Y A090697 Sequence in context: A110606 A117247 A047407 this_sequence A107303 A028876 
               A053579
%Y A090697 Adjacent sequences: A090694 A090695 A090696 this_sequence A090698 A090699 
               A090700
%K A090697 easy,nonn
%O A090697 1,1
%A A090697 Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Dec 20 2003
%E A090697 Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), 
               Dec 25 2003