3-Digit-Series are made of, it's all in a name, 3 digits.

The 3 digits of which a serie is created are to be considered hot.
They are verys strong indicators for the fact that one of those 3 digits will return to the next draw.
3-Digit-Series can stay in the run up to more than 25 draws in a row.

See the example below for clarification

This example shows the longest running 3-Digit-Serie for NY evening, up to July 9, 2007.
(the dates in this example are in European DateTime-format)

This 3-Digit-Serie is created with the digits 0, 1 and 2, and it has been running for 14 draws.
Meaning that either digit 0, digit 1 or digit 2 came to the draw. Or ofcourse 2 of them, or even all 3 of them.

All the 4-Digit-Series are also available in LotSoft.