104 (one hundred [and] four) is the natural number following 103 and preceding 105.
In mathematics 104 is a refactorable number and a primitive semiperfect number. The smallest known 4-regular matchstick graph has 104 edges and 52 vertices, where four unit line segments intersect at every vertex. The second largest sporadic group B {\displaystyle \mathbb {B} } has a McKay–Thompson series, representative of a principal modular function is T 2 A ( τ ) {\displaystyle T_{2A}(\tau )} , with constant term a ( 0 ) = 104 {\displaystyle a(0)=104} :
j 2 A ( τ ) = T 2 A ( τ ) + 104 = 1 q + 104 + 4372 q + 96256 q 2 + ⋯ {\displaystyle j_{2A}(\tau )=T_{2A}(\tau )+104={\frac {1}{q}}+104+4372q+96256q^{2}+\cdots }
The Tits group T {\displaystyle \mathbb {T} } , which is the only finite simple group to classify as either a non-strict group of Lie type or sporadic group, holds a minimal faithful complex representation in 104 dimensions.
References
Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 133