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 A261883 #17 Jun 15 2025 18:30:42 %S A261883 2,0,6,2,9,9,4,7,4,0,1,5,9,0,0,2,6,2,6,2,4,1,4,7,1,8,0,3,6,3,8,4,5,8, %T A261883 6,9,8,0,4,2,5,3,3,3,6,0,5,0,0,7,3,4,9,5,0,9,5,8,5,7,1,1,9,0,8,7,3 %N A261883 Decimal expansion of 1 - 2^(-1/3). %C A261883 Blomer shows that there are x/log^k x powerful numbers up to x, where k = 0.20629947... is this constant. %H A261883 Valentin Blomer, <a href="http://dx.doi.org/10.1112/S0024610704006040">Binary quadratic forms with large discriminants and sums of two squareful numbers II</a>, Journal of the London Mathematical Society 71:1 (2005), pp. 69-84. %H A261883 <a href="/index/Al#algebraic_03">Index entries for algebraic numbers, degree 3</a>. %H A261883 <a href="/index/Pow#powerful">Index entries for sequences related to powerful numbers</a> %e A261883 0.20629947401590026262414718036384586980425333605007349509585711908739174... %t A261883 First@RealDigits[N[1 - 2^(-1/3), 120]] (* _Michael De Vlieger_, Sep 04 2015 *) %t A261883 RealDigits[1-1/Surd[2,3],10,120][[1]] (* _Harvey P. Dale_, Dec 05 2023 *) %o A261883 (PARI) 1 - 2^(-1/3) %Y A261883 Cf. A076871, A001694. %K A261883 nonn,cons,easy %O A261883 0,1 %A A261883 _Charles R Greathouse IV_, Sep 04 2015