{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-05-26T00:16:20.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2026-05-26T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":1204,"title":"Prime Time","description":"All you need to do here is submit your solution a prime number of seconds after the top of the hour.  Any hour at all...  Easy, right?","description_html":"\u003cp\u003eAll you need to do here is submit your solution a prime number of seconds after the top of the hour.  Any hour at all...  Easy, right?\u003c/p\u003e","function_template":"function y = prime_time(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nfiletext = fileread('prime_time.m')\r\nassert(isempty(strfind(filetext, 'fopen')))\r\n%%\r\nx=123\r\ny = prime_time(x)\r\na=clock\r\nb=floor(polyval(a(5:6),60))\r\nif isprime(b)\r\ny_correct= y\r\nelse \r\ny_correct = NaN; \r\nend\r\nassert(isequal(y,y_correct),sprintf('%s%g%s','Time is ',datestr(now,13),', or ',b,' seconds after the hour.'))","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":1615,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":63,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2013-01-14T18:34:19.000Z","updated_at":"2025-11-22T17:34:33.000Z","published_at":"2013-01-14T18:34:19.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAll you need to do here is submit your solution a prime number of seconds after the top of the hour. Any hour at all... Easy, right?\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"problem_search":{"problems":[{"id":1204,"title":"Prime Time","description":"All you need to do here is submit your solution a prime number of seconds after the top of the hour.  Any hour at all...  Easy, right?","description_html":"\u003cp\u003eAll you need to do here is submit your solution a prime number of seconds after the top of the hour.  Any hour at all...  Easy, right?\u003c/p\u003e","function_template":"function y = prime_time(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nfiletext = fileread('prime_time.m')\r\nassert(isempty(strfind(filetext, 'fopen')))\r\n%%\r\nx=123\r\ny = prime_time(x)\r\na=clock\r\nb=floor(polyval(a(5:6),60))\r\nif isprime(b)\r\ny_correct= y\r\nelse \r\ny_correct = NaN; \r\nend\r\nassert(isequal(y,y_correct),sprintf('%s%g%s','Time is ',datestr(now,13),', or ',b,' seconds after the hour.'))","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":1615,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":63,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2013-01-14T18:34:19.000Z","updated_at":"2025-11-22T17:34:33.000Z","published_at":"2013-01-14T18:34:19.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eAll you need to do here is submit your solution a prime number of seconds after the top of the hour. 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