%I A050258
%S A050258 1,2,5,12,38,166,899,4768,28388,180529,1209318,8398278,60070590,
%T A050258 441296836,3314576487
%N A050258 Number of prime quadruples with largest member < 10^n.
%H A050258 Thomas R. Nicely, <a href="http://www.trnicely.net/quads/quads.html">
               More information (1)</a>
%H A050258 Thomas R. Nicely, <a href="http://www.trnicely.net/quads/tabpi4.html">
               More information (2)</a>
%H A050258 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               PrimeQuadruplet.html">Link to a section of The World of Mathematics.</
               a>
%H A050258 <a href="Sindx_Pri.html#primepop">Index entries for sequences related 
               to numbers of primes in various ranges</a>
%t A050258 c =1; Do[ Do[ If[ PrimeQ[ n ] && PrimeQ[ n + 2 ] && PrimeQ[ n + 6 ] && 
               PrimeQ[ n + 8 ], c++ ], {n, 10^n + 1, 10^(n + 1), 10} ]; Print[ c 
               ], {n, 1, 15} ]
%Y A050258 Cf. A007530.
%Y A050258 Sequence in context: A130221 A036782 A050237 this_sequence A051436 A054581 
               A140440
%Y A050258 Adjacent sequences: A050255 A050256 A050257 this_sequence A050259 A050260 
               A050261
%K A050258 nonn,nice,hard
%O A050258 1,2
%A A050258 Eric Weisstein (eric(AT)weisstein.com)