Search: id:A011786
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%I A011786
%S A011786 1,20160,12130560,660602880,29016000000,244552089600,4635182361600,
%T A011786 21646635171840,174060277297920,584962560000000,4139330225184000,
%U A011786 8013482872012800,50858076935877120,93445276409856000
%N A011786 Number of 4 X 4 matrices whose determinant is 1 mod n.
%H A011786 T. D. Noe, <a href="b011786.txt">Table of n, a(n) for n=1..1000</a>
%F A011786 a(n) = n^16/phi(n) * product (1-1/p^4)*(1-1/p^3)*(1-1/p^2)*(1-1/p) where 
               the product is over all the primes p that divide n. Multiplicative 
               with a(p^e) = p^(15*e-9)*(p^4-1)*(p^3-1)*(p^2-1). - Vladeta Jovovic 
               (vladeta(AT)eunet.rs), Nov 18 2001
%Y A011786 Cf. A000056, A011785, A000252, A064767.
%Y A011786 Sequence in context: A145535 A109479 A003808 this_sequence A003801 A119648 
               A127224
%Y A011786 Adjacent sequences: A011783 A011784 A011785 this_sequence A011787 A011788 
               A011789
%K A011786 nonn,mult
%O A011786 1,2
%A A011786 benlove(AT)preston.polaristel.net (Benjamin T. Love)
%E A011786 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 18 2001

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