%I A093911
%S A093911 1,2,4,7,11,17,27,47,87,167,327,635,1263,2519,5007,10007,19947,39875,
%T A093911 79739,159399,318779,637503,1274999,2549979,5099903,10199787,20399535,
%U A093911 40799063,81598083,163196135,326392259,652784499,1305568943,2611137839
%N A093911 Group the natural numbers so that the n-th group has at least n members 
               and every group product is a multiple of that of the previous group. 
               a(n) is the first member of the n-th group.
%e A093911 The first 5 groups are (1), (2,3), (4,5,6), (7,8,9,10),
%e A093911 (11,12,13,14,15,16). The 5th group ends with 16 because
%e A093911 11*12*13*14*15*16 is divisible by 7*8*9*10, but 11*12*13*14*15 is not.
%Y A093911 Cf. A090905, A093910, A093912, A093913.
%Y A093911 Sequence in context: A023430 A023429 A023428 this_sequence A152398 A023427 
               A129929
%Y A093911 Adjacent sequences: A093908 A093909 A093910 this_sequence A093912 A093913 
               A093914
%K A093911 nonn,easy,less
%O A093911 1,2
%A A093911 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 24 2004
%E A093911 Edited and extended by David Wasserman (dwasserm(AT)earthlink.net), Mar 
               27 2006