\magnification=1200 \hsize=4in \overfullrule=0pt \input amssym %\def\frac#1 #2 {{#1\over #2}} \def\emph#1{{\it #1}} \def\em{\it} \nopagenumbers \noindent % % {\bf Adam Wolfe} % % \medskip \noindent % % {\bf 5-sparse Steiner Triple Systems of Order $n$ Exist for Almost All Admissible $n$} % % \vskip 5mm \noindent % % % % Steiner triple systems are known to exist for orders $n \equiv 1,3$ mod $6$, the admissible orders. There are many known constructions for infinite classes of Steiner triple systems. However, Steiner triple systems that lack prescribed configurations are harder to find. This paper gives a proof that the spectrum of orders of 5-sparse Steiner triple systems has arithmetic density $1$ as compared to the admissible orders. \bye .