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 A051832 #31 Feb 16 2025 08:32:41 %S A051832 0,1,7,133 %N A051832 Numbers k such that (2*10^(5*k) - 10^(4*k) + 2*10^(3*k) + 10^(2*k) + 10^k + 1)/3 is prime. %C A051832 The Baxter-Hickerson function provides a number whose cube lacks zeros. %C A051832 The next term is > 4400. - _Jason Earls_, Sep 10 2005 %C A051832 The next term is > 20000 (found using pfgw64). - _Patrick De Geest_, Jul 22 2012 %H A051832 Ed Pegg, Jr., <a href="http://www.mathpuzzle.com/numbers.html">Fun with numbers</a>. %H A051832 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Baxter-HickersonFunction.html">Baxter-Hickerson Function</a>. %p A051832 f := n->(2*10^(5*n) - 10^(4*n) + 2*10^(3*n) + 10^(2*n) + 10^n + 1)/3; %o A051832 (PARI) is(n)=isprime((2*10^(5*n)-10^(4*n)+2*10^(3*n)+10^(2*n)+10^n+1)/3) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A051832 Cubes: A052044, A052045, A051750, A051751, A051833. Squares: A052040, A052041, A052042, A052043. %K A051832 hard,nonn %O A051832 1,3 %A A051832 _G. L. Honaker, Jr._, Dec 11 1999