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.
%I A218562 #11 Jul 04 2020 05:50:46 %S A218562 57,68,182,193,239,307,318,432,443,557,568,682,693,807,818,932,943, %T A218562 1057,1068,1182,1193,1307,1318,1432,1443,1557,1568,1682,1693,1807, %U A218562 1818,1932,1943,1958,1985,2057,2068,2182,2193,2307,2318,2432,2436,2443,2557,2568 %N A218562 Numbers k such that k^2 + 1 is divisible by a cube. %H A218562 Amiram Eldar, <a href="/A218562/b218562.txt">Table of n, a(n) for n = 1..10000</a> %e A218562 239 is in the sequence because 239^2 + 1 = 2 * 13 ^ 4. %e A218562 1985 is in the sequence because 1985^2 + 1 = 2 * 17 ^ 3 * 401. %t A218562 Select[Range[2,2600],Max[Transpose[FactorInteger[#^2+1]][[2]]]>2&] %Y A218562 Cf. A002522, A049532, A034939. %Y A218562 Cf. A000578 (cubes). %K A218562 nonn %O A218562 1,1 %A A218562 _Michel Lagneau_, Nov 02 2012