when did leningrad changed back to st petersburg
Saint Petersburg Situated on the Neva River, at the head of the Gulf of Finland on the Baltic Sea, it was founded by Tsar Peter the Great on May 27 [O.S. 16] 1703. On 1 September 1914, the name was changed from Saint Petersburg to Petrograd (Russian: Петрогра́д, IPA: [pʲɪtrɐˈgrat]), on 26 January 1924 to Leningrad (Russian: Ленингра́д, IPA: [lʲɪnʲɪnˈgrat]), and on 7 September 1991 back to Saint Petersburg.[10] Between 1713 and 1728 and in 1732–1918, Saint Petersburg was the capital of Imperial Russia. In 1918, the central government bodies moved to Moscow,[11] which is about 625 kilometres (388 mi) to the south-east.
Saint Petersburg An admirer of everything Dutch, Peter the Great originally named the city, Sankt-Peterburg (Russian: Санкт-Петербург;[a] note that the Russian name lacks the letter s between Peter and burg).[14] On 1 September 1914, after the outbreak of World War I, the Imperial government renamed the city Petrograd (Russian: Петрогра́д[a], IPA: [pʲɪtrɐˈgrat]),[15] meaning "Peter's city", in order to expunge the German-sounding words Sankt and Burg. On 26 January 1924 it was renamed to Leningrad (Russian: Ленингра́д, IPA: [lʲɪnʲɪnˈgrat]), meaning "Lenin's City". On 6 September 1991, the original name, Sankt-Peterburg, was returned. Today, in English the city is known as "Saint Petersburg". Local residents often refer to the city by its shortened nickname, Piter (Russian: Пи́тер, IPA: [ˈpʲitʲɪr]).
Captain Underpants September 1, 1997 - August 25, 2015 (main series)
1 + 2 + 3 + 4 + ⋯ which increases without bound as n goes to infinity. Because the sequence of partial sums fails to converge to a finite limit, the series does not have a sum.