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 A119320 #15 Sep 18 2021 09:05:16 %S A119320 1,5,2,2,2,3,2,3,9,3,3,3,11,3,2,6,11,7,9,17,3,3,11,3,3,17,5,5,9,33,11, %T A119320 17,17,3,11,41,39,11,29,7,11,6,21,11,17,17,9,17,11,7,11,83,49,3,2,11, %U A119320 3,38,23,7,11,14,9,33,3,11,11,11,31,66,9,47,21,17,29 %N A119320 Difference between 10^n and the largest n-digit semiprime. %H A119320 Amiram Eldar, <a href="/A119320/b119320.txt">Table of n, a(n) for n = 1..100</a> %F A119320 a(n) = 10^n - A098450(n). %o A119320 (PARI) a(n) = my(k=10^n-1); while (bigomega(k) != 2, k--); 10^n - k; \\ _Michel Marcus_, Sep 18 2021 %Y A119320 Cf. A098450. %K A119320 base,nonn %O A119320 1,2 %A A119320 _Zak Seidov_, May 14 2006 %E A119320 More terms from _Amiram Eldar_, Sep 18 2021