other Mathematical Modeling and Applications of OR Mathematical Modeling and Applications of OR پژوهشی Original <span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:&quot;Calibri&quot;,sans-serif"><i><span style="font-size:10.0pt"><span style="font-family:&quot;Times New Roman&quot;,serif"><span style="color:black">In this paper, a new method is presented using a combination of deep learning method, specifically recursive neural network, and Markov chain. The aim is to obtain more realistic results with lower cost in predicting COVID-19 patients. For this purpose, the BestFirst algorithm is used for the search section, and the Cfssubseteval algorithm is implemented for evaluating the features in the data preprocessing section. The proposed method is simulated using the real data of COVID-19 patients who were hospitalized in treatment centers of Tehran treatment management affiliated to the Social Security Organization of Iran in 2020. The obtained results were compared with three valid advanced methods. The results showed that the proposed method significantly reduces the amount of memory resource usage and CPU usage time compared to similar methods, and at the same time, the accuracy also increases significantly.</span></span></span></i></span></span></span><br> &nbsp; Prediction, Covid-19, Recovery, Markov Chain, Recurrent Neural Network 21 43 http://iors.ir/journal/browse.php?a_code=A-10-1422-67&slc_lang=other&sid=1 Mehrdad Fadaei PellehShahi Mehrdad Fadaei PellehShahi m.fadaei.1357@gmail.com 1111111111 1111111111 No Iranian Social Security Organization Iranian Social Security Organization Sohrab Kordrostami Sohrab Kordrostami kordrostami@liau.ac.ir 1111111111 1111111111 Yes Department of Mathematics, Lahijan Branch, Islamic Azad University, Lahijan, Iran Lahijan Branch, Islamic Azad University Amir Hossein Refahi Sheikhani Amir Hossein Refahi Sheikhani ah_refahi@liau.ac.ir 1111111111 1111111111 No Department of Mathematics, Lahijan Branch, Islamic Azad University, Lahijan, Iran Lahijan Branch, Islamic Azad University Marzieh Faridi Masouleh Marzieh Faridi Masouleh m.faridi@ahrar.ac.ir 1111111111 1111111111 No Computer and Information Technology Department, Ahrar Institute of Technology and Higher Education, Rasht, Iran Ahrar Institute of Technology and Higher Education Soheil Shokri Soheil Shokri soheilshokri@gmail.com 1111111111 1111111111 No Department of Mathematics, Lahijan Branch, Islamic Azad University, Lahijan, Iran Department of Mathematics, Lahijan Branch, Islamic Azad University, Lahijan, Iran