My stats of triple number combinations:
number combination/count:
`111 - 2877
`000 - 2345
`444 - 2318
`666 - 2203 ("devil ratio" 1:132.95)
`777 - 2122
`555 - 2061
`333 - 1954
`222 - 1940
`888 - 1899
`999 - 1635
total - 21354 (292892 bills entered in total)
top combinations by denomination (year of issue/serial letter/"number combination"/count):
5 2013 V `444 - 1000 (43% of "444" combinations

)
10 2014 U `000 - 473
20 2015 S `111 - 167
50 2017 P `333 - 97
100 2002 X `111 - 15
200 2019 U `888 - 11
500 2002 X `000 - 3
top5 most common combinations of "666":
5 V `666 - 949
5 S `666 - 225
10 E `666 - 156
10 P `666 - 127
5 U `666 - 118
"666" combinations by denomination:
5 `666 - 1507 (0.78% of 193984 bills of 5€ entered in total)
10 `666 - 475 (59849 total)
20 `666 - 120 (20456 total)
50 `666 - 82 (15014 total)
100 `666 - 17 (3159 total)
200 `666 - 2 (292 total)
500 `666 - 0 (138 total)
"666" combinations by serial letter:
V `666 - 989
S `666 - 305
U `666 - 185
P `666 - 163
E `666 - 162
N `666 - 121
Z `666 - 67
X `666 - 59
M `666 - 57
Y `666 - 54
T `666 - 24
W `666 - 11
R `666 - 3
L `666 - 2
F `666 - 1
"666" combinations by series:
Europa series `666 - 2132
1rst series `666 - 71