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.

A078382 Sum of divisors of numbers which can be written as sum of a positive square and a positive cube.

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%I A078382 #9 Mar 27 2025 04:24:11
%S A078382 3,6,13,18,28,18,60,42,56,32,48,91,38,44,84,93,98,80,104,84,126,195,
%T A078382 74,140,186,126,90,112,217,102,280,114,186,312,128,255,176,204,192,
%U A078382 180,266,372,300,192,294,324,260,360,240,228,320,399,198,504,312,434,256
%N A078382 Sum of divisors of numbers which can be written as sum of a positive square and a positive cube.
%H A078382 Amiram Eldar, <a href="/A078382/b078382.txt">Table of n, a(n) for n = 1..10000</a>
%F A078382 a(n) = A000203(A055394(n)).
%t A078382 DivisorSigma[1, Select[Range[200], Length[Reduce[a^2 + b^3 == # && a > 0 && b > 0, {a, b}, Integers]] > 0 &]] (* _Amiram Eldar_, Mar 27 2025 *)
%Y A078382 Cf. A000203, A055394, A078381, A078383, A078384.
%K A078382 nonn
%O A078382 1,1
%A A078382 _Reinhard Zumkeller_, Nov 25 2002