Search: id:A060871
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%I A060871
%S A060871 6,384,19494,960000,47073606,2306841984,113036904294,5538819840000,
%T A060871 271402252867206,13298710955443584,651636840771389094,
%U A060871 31930205225480640000,1564580056242329380806,76664422757230585805184
%N A060871 Number of n X n matrices over GF(7) with rank 1.
%H A060871 Harry J. Smith, <a href="b060871.txt">Table of n, a(n) for n=1,...,200</
               a>
%F A060871 a(n) = 1/6 * (7^n - 1)^2
%e A060871 a(2) = 384 because there are 385 (the second element in sequence A060721) 
               singular 2X2 matrices over GF(7), that have rank <= 1 of which only 
               the zero matrix has rank zero so a(2) = 385 - 1 = 384.
%o A060871 (PARI) { for (n=1, 200, write("b060871.txt", n, " ", (7^n - 1)^2 / 6); 
               ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 13 2009]
%Y A060871 Cf. A060721.
%Y A060871 Sequence in context: A099595 A158041 A078207 this_sequence A162137 A119645 
               A058807
%Y A060871 Adjacent sequences: A060868 A060869 A060870 this_sequence A060872 A060873 
               A060874
%K A060871 nonn,easy
%O A060871 1,1
%A A060871 Ahmed Fares (ahmedfares(AT)my-deja.com), May 04 2001
%E A060871 More terms from Larry Reeves (larryr(AT)acm.org), May 07 2001

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