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Pseudo Galois numbers for d=21.
1

%I #12 Dec 30 2012 02:00:31

%S 1,420,81496800,6988909668048000,264339188251171547754240000,

%T 4409145118315866486641282521305984000000,

%U 32432910584848683243891703579686352553931989191680000000

%N Pseudo Galois numbers for d=21.

%H Vincenzo Librandi, <a href="/A028683/b028683.txt">Table of n, a(n) for n = 0..27</a>

%F a(n) = d^n * product(d^n - d^k, k=0..n-1).

%t FoldList[ #1*21^#2 (21^#2-1)&, 1, Range[ 20 ] ]

%K nonn

%O 0,2

%A _Olivier GĂ©rard_