What is the relationship of Gustaf Eneström with Leonard Euler? Gustaf (Gustav) Eneström (1852-1923) was a Swedish mathematician, who in addition to his scientific achievements in the history of mathematics and in mathematics, became famous for his completion, in the years 1910-1913, of all the work of Euler. He counted and numbered them from 1 to 866, including books, articles and some important letters of Euler. This is precisely the reason why the persona of Eneström will be described. We should be grateful to him for bringing together Euler's scientific achievements. Another achievement of Eneström was to cause interest by mathematicians to the history of mathematics, where his guiding principle was scientific accuracy. He was founder and editor for 21 years of important journal "Bibliotheca Mathematica", printing papers on history of mathematics.His life and scientific achievements has been described here, as well as, it is explained what does it mean the "Eneström index" of Euler's works. The contents of the paper is divided into five parts. The first discusses the life and scientific achievements of Eneström. Eneström is known in the mathematical literature mainly from the work regarding the history of mathematics and Eneström-Kakeya theorem. The second part presents in detail the Eneström index about Euler's papers. The third part is a literature on Gustaf Eneström, while the fourth and fifth contain cited papers or books, first of Eneström, and then other authors. Original titles of books and papers of Eneström, written in Swedish, German or French have been translated into English or Polish, and in the text titles are written in Polish.
2008. Vol. 2, 27-36 p.