%I A005123
%S A005123 2,5,9,11,12,14,17,24,29,30,32,35,39,42,44,50,51,54,56,
%T A005123 57,65,71,72,74,75,77,80,84,95,96,101,107,110,116,117,119,
%U A005123 122,126,129,131,137,141,144,149,150,152,156,161,162,165
%N A005123 (( primes == 1 mod 8 ) - 1)/8.
%H A005123 T. D. Noe, <a href="b005123.txt">Table of n, a(n) for n=1..1000</a>
%F A005123 a(n) = (A007519(n)-1)/8. - Zak Seidov, Sep 26 2007
%t A005123 a={};Do[x=8*n+1;If[PrimeQ[x],AppendTo[a,n]],{n,10^2}];a - Vladimir Orlovsky 
               (4vladimir(AT)gmail.com), Apr 29 2008
%Y A005123 Cf. A007519, A111174, A115249.
%Y A005123 Sequence in context: A088343 A110781 A115248 this_sequence A154732 A080154 
               A069829
%Y A005123 Adjacent sequences: A005120 A005121 A005122 this_sequence A005124 A005125 
               A005126
%K A005123 nonn
%O A005123 1,1
%A A005123 N. J. A. Sloane (njas(AT)research.att.com).