Page "Electronic Delay Storage Automatic Calculator" Paragraph 2
from
Wikipedia
Later the project was supported by J. Lyons & Co. Ltd., a British firm, who were rewarded with the first commercially applied computer, LEO I, based on the EDSAC design.
EDSAC ran its first programs on 6 May 1949, when it calculated a table of squares and a list of prime numbers.
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2.061 seconds.