search.htm
UseNumericOperators {yes | no}
When UseNumericOperators is set to yes, the < and > signs are interpreted as numeric operators and ignored otherwise.
The default value is no.
UseNumericOperators yes
the Section called Searching numbers in Chapter 10.
Affix, AlwaysFoundWord, Dehyphenate, IspellUsePrefixes, Spell, SQLWordForms, StopwordFile, Synonym.