That is the impression that this book gives at first. Over a thousand outstanding numbers we list it as such 3663002302 which is the number of first number of 11 digits. But what is most interesting in my opinion these are the concepts of number theory to which we alluded such as Mersenne numbers or numbers of Heegner.qui are explained in the text. It has the merit of being very affordable. All this is a state of mind that is not mine, although I like math. I guess you can use this book to create your pass codes .... Hmmmm ....