I bought "Интегралы и ряды" in 1988 (Moscow, SU). Contributor to OEIS since 2016.
Since I consider both "the beautiful", cycles as well as numbers as empierically perceptible information, especially the natural numbers are an object of the physics describing the nature. Thus we physicists think a little different than mathematicians - especially we solve problems (pragmatically): "About Primes and Polygonal Numbers" .
Please note my current (not yet peer-reviewed) proof of the 3rd LANDAU problem: