shuffling news

[Warut Roonguthai]

FYI, this card-shuffling topic was discussed in David Gale's column
"Mathematical Entertainments" on pages 54-56 of "The Mathematical
Intelligencer" vol. 14, no. 1, 1992.

Here is the number of shuffles required for card n to reach the top
for the first time according to the 80-hour computation on a NeXT
workstation mentioned in the article:

card     shuffles

  39        13932
  43        30452
  53           30
  54    252992198
3464  21879255397
3729  15009146841
4546   2263846432

Later,
Warut (is back!)