when was it introduced ?
November 10, 1969
Sesame Street
 The program premiered on public television stations on November 10, 1969. 
what does the number at the beginning of sesame street mean UNANSWERABLE what is this street ? It  an American educational children's television series that combines live action, sketch comedy, animation and puppetry
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Sesame Street [SEP] History
The show's success continued into the 1980s. In 1981, when the federal government withdrew its funding, CTW turned to, and expanded, other revenue sources, including its magazine division, book royalties, product licensing, and foreign broadcast income. "Sesame Street"s curriculum has expanded to include more affective topics such as relationships, ethics, and emotions. Many of the show's storylines were taken from the experiences of its writing staff, cast, and crew, most notably, the 1982 death of Will Lee—who played Mr. Hooper—and the marriage of Luis and Maria in 1988. By the end of the 1990s, "Sesame Street" faced societal and economic challenges, including changes in viewing habits of young children, competition from other shows, the development of cable television, and a drop in ratings.