AOJ 2286 Farey Sequence

Solved Users (link to submissions)
aizu_a
arrows
atetubou
bal4u
bontakun
Charo
chronotable
cos
Darsein
DEGwer
dr_ken
E869120
eagletmt
ee67052
eha
ei1333
flowlight
Fumito
fura2
hadrori
hakomo
hogloid
ichyo
inuhiroshi
Isa_rentacs
ishikado
ixmel
jag_staff
johnsmith
kagamiz
kmatsunaga
koba2_15
kohyatoh
kyuridenamida
kzyKT
k_operafan
laycurse
leafmoon
mamekin
median0816
mikeCAT
mitaki28
Mi_Sawa
mondatto
moti
MT910418
nadeko
namonakiaccount
naoto172
ne200031
nisshy
no15_renne
okaoka
orpheus
paruki
peryaudo
poeticmoon
ponyopoppo
prpr
puyopop
Respect2D
ritsumei
ryoga
s1180007
s1180132
s1180133
s1190048
s1210207
shimasuzu
sinapusu2002
skl0123
slip0110
square1001
stqn
sune2
takapt0226
tnakao
tokoharu
tomoya
tozangezan
triceps
tsu_ra_i
ty70
ukuku09
ustimaw
voide
wotsushi
yasu0207
yuki
yukim
yuta1024
yuusti
zerokugi