login
Prime numbers which cannot be written in the form x^2 + 10*y^2.
0

%I #9 Sep 10 2012 12:36:48

%S 2,3,5,7,13,17,23,29,31,37,43,47,53,61,67,71,73,79,83,97,101,103,107,

%T 109,113,127,137,149,151,157,163,167,173,181,191,193,197,199,223,227,

%U 229,233,239,257,263,269,271,277,283,293,307,311,313,317,337,347

%N Prime numbers which cannot be written in the form x^2 + 10*y^2.

%C Prime numbers not congruent to {1, 9, 11, 19} mod 40.

%Y Cf. A020673, A033201.

%K nonn

%O 1,1

%A _V. Raman_, Sep 08 2012