Question 70579
K CAN BE ANY NUMBER WHEN THE DIFFERENCE OF THE TWO FACTORS = 1.
THUS 2=2*1 2-1=1
6=3*2 3-2=1
12=4*3 4-3=1
20=5*4 5-4=1
30=6*5 6-5=1
35=7*6 7-6=1 
ETC.