Modelling the first 100 digits of the number Pi (π) using the objective regressive regression methodology

Every year the existence of the number π is celebrated around the world, new applications are presented and festivities are held. The aim of this research is to model the first 100 digits of the number π using the ROR methodology. Through this research we will see a new definition of this number and we will try to encourage undergraduate students to be motivated to study mathematics, we will also see a modelling of the first 100 digits of π. As a result, the first 100 digits of the number π can be modelled and predicted explaining 88 % of variability, with an error of 2.74. By modelling the Objective Regressive Regression (ORR), a model with more variables that also explain a high level of variance is also obtained. The short-term model depends on the variables sawtooth and inverted sawtooth, which are characteristic of the ROR model, and also depends on the number of digits two steps back linearly.