Euler in Babylon

Permutations of Project

February 09, 2014

Consider the alphabet A made out of the letters of the word "project": A={c,e,j,o,p,r,t}. Let T(n) be the number of strings of length n consisting of letters from A that do not have a substring that is one of the 5040 permutations of "project".

T(7)=77-7!=818503.

Find T(1012). Give the last 9 digits of your answer.


gamwe6

Written by gamwe6 who lives and works in San Francisco building useful things. You should follow him on Twitter