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 A056784 #10 Oct 28 2021 12:37:08 %S A056784 1,8,90,524,9552,31398,2010734,2300942550,2614941710600, %T A056784 352521223451364324 %N A056784 First nonprime in a sequence of consecutive nonprimes which is at least twice as long as any earlier run of consecutive nonprimes in this list. %H A056784 Thomas R. Nicely, <a href="https://faculty.lynchburg.edu/~nicely/gaps/gaplist.html">First occurrence prime gaps</a> [For local copy see A000101] %e A056784 2300942550 is the first of 319 consecutive composite numbers. %e A056784 2614941710600 is the first of 651 consecutive composite numbers. %e A056784 352521223451364324 is the first of 1327 consecutive composite numbers. %Y A056784 Cf. A008950, A008995, A008996, A114100, A002386. %K A056784 nonn %O A056784 1,2 %A A056784 _Frank James Michael Richards_, Jun 19 2001 %E A056784 Corrected by _R. J. Mathar_, Sep 29 2006 %E A056784 Three more terms from _Donovan Johnson_, Jan 28 2008