A064980 - OEIS

%I #2 Mar 30 2012 17:30:36

%S 719,11225,16736,19304,29117,43496,64259,75542,88514,99803,119195,

%T 131051,153080,153179,154874,155720,162188,163091,163778,175214,

%U 200303,204098,221330,257135,258845,268559,276401,322454,357251,358217,385565

%N n*10^6-1, n*10^6-3, n*10^6-7 and n*10^6-9 are all prime.

%t Select[ Range[5 10^5], PrimeQ[10^6# - 1] && PrimeQ[10^6# - 3] && PrimeQ[10^6# - 7] && PrimeQ[10^6# - 9] &]

%K easy,nonn

%O 1,1

%A _Robert G. Wilson v_, Oct 30 2001