@luizd917: Graham's Number is a number so gigantic that it is much larger than the number of atoms in the observable universe. It was created by the mathematician Ronald Graham to solve a combinatorics problem. It is not possible to write it in decimal notation: it would have an unimaginably large number of digits. It is defined using a sequence of Knuth's upward arrow operations. Simplifying: G_1 = 3 \uparparrows\uparrows\uparrows\uparrows 3 (with a huge number of arrows). Each subsequent number uses the previous one to determine how many arrows it will have. Graham's Number is . Despite being immense, it is finite. A curious fact is that the last 10 digits of Graham's Number are: #riograndedosul #santacatarina #parana #fyp #fy