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 A092206 #17 Feb 16 2025 08:32:52 %S A092206 2,5,6,7,8,10,11,13,14,15,17,18,19,20,21,22,23,24,26,28,29,30,31,32, %T A092206 33,34,35,37,38,39,40,41,42,43,44,45,46,47,50,51,52,53,54,55,56,57,58, %U A092206 59,60,61,62,63,65,66,67,68,69,70,71,72,73,74,76,77,78,79,80,82,83,84 %N A092206 Positive integers that are not of the form n^2 or 3n^2. %C A092206 Values of n such that Q(sqrt(-n)) has 2 units. %C A092206 A214295(a(n)) = 0. - _Reinhard Zumkeller_, Jul 12 2012 %H A092206 Reinhard Zumkeller, <a href="/A092206/b092206.txt">Table of n, a(n) for n = 1..10000</a> %H A092206 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Unit.html">Unit</a> %t A092206 Select[ Range[100], Not[ IntegerQ[ Sqrt[#] ] || IntegerQ[ Sqrt[#/3] ] ]&] (* _Jean-François Alcover_, Oct 30 2012 *) %o A092206 (Haskell) %o A092206 a092206 n = a092206_list !! (n-1) %o A092206 a092206_list = filter ((== 0) . a214295) [1..] %o A092206 -- _Reinhard Zumkeller_, Jul 12 2012 %o A092206 (PARI) is(n)=!issquare(n/3^valuation(n,3)) \\ _Charles R Greathouse IV_, Oct 30 2012 %Y A092206 Cf. A000290, A033428, A092205. %K A092206 nonn %O A092206 1,1 %A A092206 _Eric W. Weisstein_, Feb 24 2004