A031399 - OEIS

%I #9 Aug 30 2014 18:57:19

%S 4,8,16,20,25,32,34,40,52,64,68,80,100,104,116,128,136,146,148,160,

%T 164,169,178,194,200,205,208,212,221,232,244,256,260,272,289,292,296,

%U 305,320,328,340,356,377,386,388,400,404,410,416,424,436,452

%N Numbers n with no 4k+3 factors such that Pell equation x^2 - n y^2 = -1 insoluble.

%D "Advanced Number Theory" by Harvey Cohn.

%H Joerg Arndt, <a href="http://www.jjj.de/fxt/#fxtbook">Matters Computational (The Fxtbook)</a>

%Y Cf. A031396, A031397, A031398.

%K nonn

%O 1,1

%A _David W. Wilson_