Search: id:A090693
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%I A090693
%S A090693 2,3,5,7,11,15,17,21,25,27,37,41,55,57,67,75,85,91,95,111,117,121,125,
%T A090693 127,131,135,147,151,157,161,171,177,181,185,205,207,211,225,231,237,
%U A090693 241,251,257,261,265,271,281,285,301,307,315,327,341,351,385,387,397
%N A090693 Numbers n such that n^2 - 2n + 2 is a prime.
%D A090693 M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, 
               Bologna 1988
%D A090693 Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, 
               CittaStudiEdizioni, Milano 1997
%F A090693 a(n) = A005574(n)+1.
%Y A090693 A002496 gives primes, A062325 gives prime index. Cf. A001912.
%Y A090693 A005574(n+1) + 1.
%Y A090693 Sequence in context: A027341 A094252 A106532 this_sequence A049756 A026813 
               A008636
%Y A090693 Adjacent sequences: A090690 A090691 A090692 this_sequence A090694 A090695 
               A090696
%K A090693 easy,nonn
%O A090693 1,1
%A A090693 Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Dec 19 2003
%E A090693 Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), 
               Dec 28 2003

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