Search: id:A067063
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%I A067063
%S A067063 11,3,11,41,3,239,11,3,11,21649,3,53,11,3,11,2071723,3,
%T A067063 1111111111111111111,11,3,11,11111111111111111111111,3,41,11,3,11,3191,
%U A067063 3,2791,11,3,11,41,3,2028119,11,3,11,83,3,173,11,3,11,35121409,3,239
%N A067063 Smallest prime factor of repunit(n) = (10^n-1)/9 (A002275).
%C A067063 a(3n) = 3, a(6n-4) = a(6n-2) = 11, a(30n-25) = a(30n-5) = 41, ... - M. 
               F. Hasler (Maximilian.Hasler(AT)gmail.com), Nov 21 2006
%D A067063 Amarnath Murthy, On the divisors of Smarandache Unary Sequence, Smarandache 
               Notions Journal, Vol. 11, No. 1-2-3, Spring 2000.
%D A067063 David Wells, The Penguin Dictionary of Curious and Interesting Numbers.
%H A067063 T. D. Noe, <a href="b067063.txt">Table of n, a(n) for n=2..500</a> (derived 
               from Yousuke Koide)
%H A067063 M. L. Perez et al., eds., <a href="http://www.gallup.unm.edu/~smarandache/
               ">Smarandache Notions Journal</a>
%H A067063 Samuel S. Wagstaff, <a href="http://www.cerias.purdue.edu/homes/ssw/cun/
               index.html">the Cunningham Project</a>
%H A067063 Makoto Kamada, <a href="http://homepage2.nifty.com/m_kamada/math/11111.htm">
               Factorizations of 11...11 (Repunit)</a>.
%H A067063 Yousuke Koide, <a href="http://www.h4.dion.ne.jp/~rep/">Factorizations 
               of Repunit Numbers</a>
%p A067063 'min(op(numtheory[factorset]((10^k-1)/9)))'$k=2..50; - M. F. Hasler (Maximilian.Hasler(AT)gmail.com), 
               Nov 21 2006
%t A067063 a = {}; Do[a = Append[a, FactorInteger[(10^n - 1)/9][[1, 1]]], {n, 2, 
               111} ]; a
%Y A067063 Cf. A003020, A002275, A102380.
%Y A067063 Sequence in context: A082769 A110435 A110774 this_sequence A075023 A088262 
               A110406
%Y A067063 Adjacent sequences: A067060 A067061 A067062 this_sequence A067064 A067065 
               A067066
%K A067063 nonn
%O A067063 2,1
%A A067063 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jan 03 2002
%E A067063 More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 04 2002

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