I am trying to understand how we got 10,240 possible straights in the game of poker. Of the formula that have found on http://en.wikipedia.org/wiki/List_of_poker_hands#Straight it is coherent with I understand the demoninator - which indicates the possible hands that can be dealt - and part of the numerator - i.e. 10 represents the possible hands involving a straights independently from the suite. What I do NOT understand is the 4^5 factor, can someone please kindly explain it to me?
Thanks, Luca