[GrangalanJr]

Made a visualization: x coordinate is the initial numbers, y coordinates are the "intermediate" numbers hit on the way to 6174. Diagonal is obviously the plot of the starting numbers. :-)

http://i.imgur.com/DfxRB.png

[vorg]

Have you compared this visualization with the one for 495 and with the two digit numbers?

[GrangalanJr]

Three digits: http://i.imgur.com/kQSGr.png

And two: http://i.imgur.com/OaynE.png