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Blue Peter was first aired on 16 October 1958. It had been commissioned to producer John Hunter Blair by Owen Reed, the head of children's programmes at the BBC, as there were no programmes in existence that catered for children aged between five and eight.
Built at the Victoria University of Manchester, the first version of the Mark 1 computer became operational in April 1949. Mark 1 was used to run a program to search for Mersenne primes for nine hours without error on June 16 and 17 that same year.