test_mpf using mpf 
j=0 
sum = 11, exp=2 
j=1 
sum = 21, exp=2 
j=2 
sum = 31, exp=2 
j=3 
sum = 41, exp=2 
j=4 
sum = 51, exp=2 
j=5 
sum = 61, exp=2 
j=6 
sum = 71, exp=2 
j=7 
sum = 81, exp=2 
j=8 
sum = 91, exp=2 
j=9 
sum = 101, exp=3 
 num = 123.45678E+27 
fract = 12345678, exp=30 
value = .12345678E30