Search: id:A087978
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%I A087978
%S A087978 2310,254540,1042404,21871365,129963314,830692265,4617927894,
%T A087978 18297409143,41268813542,287980277114,1182325618032,6455097761454
%N A087978 a(n) is the first term in a chain of at least n consecutive numbers, 
               each has exactly m=5(five) distinct prime factor.
%D A087978 Roger B. Eggleton and James A. MacDougall, Consecutive integers with 
               equally many principal divisors, Math. Mag. 81 (2008), 235-248. [From 
               T. D. Noe (noe(AT)sspectra.com), Oct 13 2008]
%t A087978 k=1; Do[While[Union[Table[Length[FactorInteger[i]], {i, k, k+n-1}]]!={5}, 
               k++ ]; Print[k], {n, 1, 8}]
%Y A087978 Cf. A080569[m=3], A064708[m=2], A087977[m=4], A087978[m=5].
%Y A087978 Cf. A138206, A138207, A154573. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), 
               Jan 15 2009]
%Y A087978 Sequence in context: A147572 A046303 A046403 this_sequence A020435 A035893 
               A035771
%Y A087978 Adjacent sequences: A087975 A087976 A087977 this_sequence A087979 A087980 
               A087981
%K A087978 more,nonn
%O A087978 1,1
%A A087978 Labos E. (labos(AT)ana.sote.hu), Sep 26 2003
%E A087978 More terms from Don Reble (djr(AT)nk.ca), Sep 29 2003
%E A087978 4 more terms from Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 
               06 2008
%E A087978 a(11)-a(12) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 
               15 2009

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