cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A028676 Pseudo Galois numbers for d=14.

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%I A028676 #14 Jul 14 2025 00:25:20
%S A028676 1,182,6956040,52356666223680,77265383687862143155200,
%T A028676 22349330345043106156640015717990400,
%U A028676 1267070807948330368930015476714098504169160704000,14079699332820783408928640305225880493640569562642424631656448000
%N A028676 Pseudo Galois numbers for d=14.
%H A028676 Vincenzo Librandi, <a href="/A028676/b028676.txt">Table of n, a(n) for n = 0..29</a>
%F A028676 a(n) = 14^n * Product_{k=0..n-1} (14^n - 14^k).
%F A028676 a(n) ~ c * 14^(n^2+n), where c = Product_{k>=1} (1 - 1/14^k) = 0.923471256585... . - _Amiram Eldar_, Jul 13 2025
%t A028676 FoldList[ #1*14^#2 (14^#2-1)&, 1, Range[ 20 ] ]
%t A028676 a[n_] := 14^n * Product[14^n - 14^k, {k, 0, n-1}]; Array[a, 8, 0] (* _Amiram Eldar_, Jul 13 2025 *)
%o A028676 (PARI) a(n) = 14^n * prod(k = 0, n-1, 14^n - 14^k); \\ _Amiram Eldar_, Jul 13 2025
%Y A028676 Cf. A028668, A028670, A028671, A028672, A028674, A028677, A028678, A028680, A028682, A028683, A028684, A028686.
%K A028676 nonn
%O A028676 0,2
%A A028676 _Olivier Gérard_