|
%I #11 Mar 05 2015 07:38:18
%S 7,15,23,31,39,47,55,63,71,79,87,103,127,135,151,175,183,199,207,223,
%T 247,255,271,295,343,367,375,463,487,511,583,727,751,823,847,967,1023,
%U 1087,1255,1303,1423,1527,2047,2143,3063,3343,4447,5503
%N Odd numbers congruent to 7 mod 8 such that (2^(h(-n)+2)-n) is a square, where h(-n) is the class number.
%o (PARI) forstep(n=7,1e4,8,if(issquare(2^(qfbclassno(-n)+2)-n),print1(n", "))) \\ _Charles R Greathouse IV_, May 08 2011
%K nonn
%O 1,1
%A Eric Rains (rains(AT)caltech.edu)
|
