Parenthesis {} are not occurring.Also in first D/2 ,2 is very large.+1,+2 are also very large not subscript type.
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Code, edit and compile here:
\documentclass[12pt,journal,compsoc]{IEEEtran}\usepackage{alltt}\usepackage{amssymb}\usepackage{amsfonts}\usepackage{mathtools}\usepackage{array}\usepackage{amsmath}\usepackage{graphicx}\usepackage{float}\usepackage{lipsum}\begin{document}{$D_(m/2)+1$,$D(m/2)+2$,...,$D_m$}\end{document}