Search: id:A006558
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%I A006558 M2155
%S A006558 1,2,33,242,11605,28374,171893,1043710445721,2197379769820
%N A006558 Start of first run of n consecutive integers with same number of divisors.
%C A006558 a(10)<=14366256627859031643, a(11)<=193729158984658237901148, a(12)<=1284696910355238430481207644 
               - Bilgin Ali and Bruno Mishutka (bruno_mishutka(AT)hotmail.com), 
               Dec 29 2006
%C A006558 a(10) <= 2642166652554075, a(11) <= 17707503256664346, a(12) <= 9827470582657267545. 
               - David Wasserman (dwasserm(AT)earthlink.net), Feb 22 2008
%D A006558 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 33, pp 12, Ellipses, 
               Paris 2008.
%D A006558 R. K. Guy "Unsolved Problems in Number Theory", section B18.
%D A006558 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A006558 David Wells, "The Penguin Dictionary of Curious and Interesting Numbers,
               " Penguin Books, NY, 1986, pages 147 and 176.
%Y A006558 Cf. A000005, A005237, A005238, A006601, A049051, A019273, A039665.
%Y A006558 Cf. A034173, A115158.
%Y A006558 Sequence in context: A156369 A128152 A052403 this_sequence A002561 A030448 
               A093992
%Y A006558 Adjacent sequences: A006555 A006556 A006557 this_sequence A006559 A006560 
               A006561
%K A006558 nonn
%O A006558 1,2
%A A006558 N. J. A. Sloane (njas(AT)research.att.com), Robert G. Wilson v (rgwv(AT)rgwv.com)
%E A006558 Jud McCranie points out that the entry 40311 given in Guy and Wells is 
               incorrect.
%E A006558 a(8) from Jud McCranie (j.mccranie(AT)comcast.net), Jan 20 2002
%E A006558 a(9) <= 2197379769820 from David Wasserman, Jan 08 2006; a(9)=2197379769820 
               from Jud McCranie, Jan 14 2006.

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