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 A087618 #8 Feb 16 2025 08:32:51 %S A087618 1,5,33,323,3230,32269,322619,3226343,32263377,322634281,3226340896, %T A087618 32263409594,322634100659,3226340989192 %N A087618 a(n) is the number of pair of consecutive numbers (k,k+1) with k<=10^n such that k and k+1 are both squarefree. %H A087618 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Squarefree.html">Squarefree</a> %F A087618 Asymptotic density is A065474. %Y A087618 Cf. A071172, A065474. %K A087618 nonn,more %O A087618 0,2 %A A087618 _Eric W. Weisstein_, Sep 19 2003 %E A087618 a(11)-a(13) from _Donovan Johnson_, Jun 26 2010