Cody

# Everett Rubel

Rank
##### 645
Score
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 on 21 Jan 2013 on 15 Jan 2013 on 15 Jan 2013 on 1 Dec 2012 on 1 Dec 2012 on 20 Nov 2012 on 13 Nov 2012 on 13 Nov 2012 on 31 Oct 2012 on 30 Oct 2012 on 29 Oct 2012 on 28 Oct 2012 on 27 Oct 2012 on 26 Oct 2012 Jean-Marie: The transformation between steps 2 and 3 (1 0 0 -> 1 1 0) is the same as for the one between steps 8 and 9; we are working with the entire stack of 3 coins. The first/top coin exchanges with the last/bottom coin and then all coins change their orientation. on 25 Oct 2012 on 21 Oct 2012 on 21 Oct 2012 on 21 Oct 2012 on 20 Oct 2012 on 20 Oct 2012 on 20 Oct 2012 on 20 Oct 2012 Jean-Marie: I think the phrase, "invert the substack" is the issue. For me, this means to take the substack and invert it as a unit. The coins exchange positions in the substack as well as inverting their values. It is a single physical action that translates into two separate operations on the coins. I may have done better to write, "flip the substack as a unit." on 18 Oct 2012 on 18 Oct 2012 on 16 Oct 2012 on 15 Oct 2012 on 15 Oct 2012 on 15 Oct 2012 For the bonus question, we can rule out any number that has a prime factor greater than 26 (z). The product found by Jason Friedman is the first number greater than 10^6 that does not have such a prime factor. The product 999856 is the largest number less than 10^6 to be part of a possible solution. on 14 Oct 2012 Everett Rubel received Commenter badge for Problem 42. Find the alphabetic word product on 14 Oct 2012 on 14 Oct 2012 on 13 Oct 2012 on 12 Oct 2012 on 12 Oct 2012 on 12 Oct 2012 on 11 Oct 2012 on 11 Oct 2012 on 10 Oct 2012 on 9 Oct 2012 on 6 Oct 2012 on 5 Oct 2012 on 5 Oct 2012 on 5 Oct 2012 on 5 Oct 2012 on 5 Oct 2012 on 5 Oct 2012 on 4 Oct 2012 on 4 Oct 2012 on 4 Oct 2012
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