%I #2 Mar 30 2012 17:30:36
%S 1856,13301,14003,15545,21155,21593,24851,27557,37952,40013,44906,
%T 48515,53294,53891,59162,62282,62798,65714,71900,72560,74093,77915,
%U 79910,80426,83252,91421,99632,112829,118364,121367,136025,138848
%N n*10^4-1, n*10^4-3, n*10^4-7 and n*10^4-9 are all prime.
%t Select[ Range[200000], PrimeQ[10^4# - 1] && PrimeQ[10^4# - 3] && PrimeQ[10^4# - 7] && PrimeQ[10^4# - 9] &]
%K easy,nonn
%O 1,1
%A _Robert G. Wilson v_, Oct 30 2001