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.

A047719 Numbers that are the sum of 8 but no fewer nonzero fourth powers.

This page as a plain text file.
%I A047719 #12 Jul 07 2018 01:50:24
%S A047719 8,23,38,53,68,88,103,118,128,133,148,168,183,193,198,213,228,248,263,
%T A047719 278,293,308,323,328,343,358,368,373,388,403,408,423,433,438,453,468,
%U A047719 483,488,498,503,518,533,548,563,568,578,583,598,608,613,632,647,648
%N A047719 Numbers that are the sum of 8 but no fewer nonzero fourth powers.
%H A047719 David A. Corneth, <a href="/A047719/b047719.txt">Table of n, a(n) for n = 1..20516</a> (terms <= 200000)
%o A047719 (PARI) upto(n)={my(e=8); my(s=sum(k=1, sqrtint(sqrtint(n)), x^(k^4)) + O(x*x^n)); my(p=s^e, q=(1 + s)^(e-1)); select(k->polcoeff(p,k) && !polcoeff(q,k), [1..n])} \\ _Andrew Howroyd_, Jul 06 2018
%Y A047719 Cf. A000583, A002377, A018889, A003342.
%K A047719 nonn
%O A047719 1,1
%A A047719 Arlin Anderson (starship1(AT)gmail.com)