%I A118859
%S A118859 6,53550,420420,422310,1624350,2130240,3399900,5199810,5246010,6549270,
%T A118859 7384440,7775880,9516570,9565710,10430280,11845260,13207950,14562870,
%U A118859 14619990,18747960,20099940,21596820,21968100,24358950,24610740
%N A118859 Numbers n such that n-1, n+1, 2n-1, 2n+1, 3n-1 and 3n+1 are primes.
%e A118859 6 is there because 5, 7, 11, 13, 17, 19 are all prime.
%t A118859 tb={{0}};Do[s1=n;s2=2*n;s3=3*n; If[(PrimeQ[n-1]&&PrimeQ[n+1])&&(PrimeQ[2*n-1]&& 
               PrimeQ[2*n+1])&&(PrimeQ[3*n-1]&&PrimeQ[3*n+1]),Print[{s1,s2,s3}]; 
               tb=Append[tb,n]],{n,1,100000000}];tb=Delete[tb,1]
%Y A118859 Cf. A066388, A118860.
%Y A118859 Sequence in context: A134728 A127488 A013838 this_sequence A076913 A101450 
               A101439
%Y A118859 Adjacent sequences: A118856 A118857 A118858 this_sequence A118860 A118861 
               A118862
%K A118859 nonn
%O A118859 1,1
%A A118859 Labos E. (labos(AT)ana1.sote.hu), May 03 2006
%E A118859 Edited by Don Reble (djr(AT)nk.ca), May 16 2006