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 A121110 #8 Jun 08 2017 15:09:59 %S A121110 3778888999,438939648,4478976,338688,27648,2688,768,336,54,20,0 %N A121110 Trajectory of 3778888999 under "x -> product of digits of x" map. %C A121110 This is the smallest number of persistence 10 (cf. A003001). %H A121110 N. J. A. Sloane, <a href="http://neilsloane.com/doc/persistence.html">The persistence of a number</a>, J. Recreational Math., 6 (1973), 97-98. %t A121110 Most[FixedPointList[Times@@IntegerDigits[#]&,3778888999]] (* _Harvey P. Dale_, Jun 08 2017 *) %Y A121110 Cf. A003001. %K A121110 nonn,fini,full,base %O A121110 1,1 %A A121110 _N. J. A. Sloane_, Aug 12 2006 %E A121110 Edited by _Charles R Greathouse IV_, Aug 05 2010