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.

A265625 Differences between two positive cubes in more than two ways.

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%I A265625 #11 Mar 19 2020 05:37:28
%S A265625 3367,26936,90909,152551,205352,215488,420875,622232,625177,727272,
%T A265625 754299,757701,845208,1147627,1154881,1220408,1642816,1723904,2113921,
%U A265625 2454543,2741256,3056473,3367000,3442887,3492125,4118877,4481477,4977856,5001416,5544504
%N A265625 Differences between two positive cubes in more than two ways.
%H A265625 Giovanni Resta, <a href="/A265625/b265625.txt">Table of n, a(n) for n = 1..10000</a>
%e A265625 3367 = 15^3 - 2^3 = 16^3 - 9^3 = 34^3 - 33^3.
%t A265625 r = 5544504; p = 3; Rest@Sort@Drop[Flatten@Select[Tally@Reap[Do[n = i^p - j^p; If[n <= r, Sow[n]], {i, Ceiling[(r/p)^(1/(p - 1))]}, {j, i}]][[2, 1]], #[[2]] > 2 &], {2, -1, 2}]
%Y A265625 Cf. A000578, A181123, A014439 (exactly one way), A034179 (more than one way), A014440 (exactly two ways), A014441 (exactly three ways), A333376, A333377.
%K A265625 nonn
%O A265625 1,1
%A A265625 _Arkadiusz Wesolowski_, Dec 10 2015