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 A046098 #27 Feb 16 2025 08:32:38 %S A046098 0,1,2,3,4,5,7,8,11,17,19,23,71 %N A046098 Numbers n such that central binomial coefficient C(n, floor(n/2)) is squarefree. %C A046098 No other n < 10^8. - _T. D. Noe_, Apr 06 2007 %H A046098 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CentralBinomialCoefficient.html">Central Binomial Coefficient</a> %H A046098 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Squarefree.html">Squarefree</a> %t A046098 Select[Range[0, 100], SquareFreeQ[Binomial[#,Floor[#/2]]]&] (* _Harvey P. Dale_, Mar 11 2011 *) %o A046098 (PARI) is(n)=issquarefree(binomial(n,n\2)) \\ _Charles R Greathouse IV_, Jul 16 2011 %Y A046098 Cf. A001405. %Y A046098 Cf. A056651 (cubefree central binomial coefficients). %K A046098 nonn,hard %O A046098 1,3 %A A046098 _Eric W. Weisstein_ %E A046098 0 added by _T. D. Noe_, Mar 06 2014