{"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":2492,"title":"Factorions: Numbers that equal the sum of the factorials of their digits","description":"From Wikipedia: _A factorion is a natural number that equals the sum of the factorials of its decimal digits_\r\n\r\nFor example:\r\n\r\n2!=2\r\n\r\n1!+4!+5!=145\r\n\r\nWrite a function that returns true if a number is a factorion and false otherwise.\r\n\r\nAssume all numbers are of base 10.","description_html":"\u003cp\u003eFrom Wikipedia: \u003ci\u003eA factorion is a natural number that equals the sum of the factorials of its decimal digits\u003c/i\u003e\u003c/p\u003e\u003cp\u003eFor example:\u003c/p\u003e\u003cp\u003e2!=2\u003c/p\u003e\u003cp\u003e1!+4!+5!=145\u003c/p\u003e\u003cp\u003eWrite a function that returns true if a number is a factorion and false otherwise.\u003c/p\u003e\u003cp\u003eAssume all numbers are of base 10.\u003c/p\u003e","function_template":"function y = isFactorion(x)\r\n  y = num2str(x);\r\nend","test_suite":"%%\r\nx = 0;\r\ny_correct = 0;\r\nassert(isequal(isFactorion(x),y_correct))\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nassert(isequal(isFactorion(x),y_correct))\r\n%%\r\nx = 2;\r\ny_correct = 1;\r\nassert(isequal(isFactorion(x),y_correct))\r\n%%\r\nx = 145;\r\ny_correct = 1;\r\nassert(isequal(isFactorion(x),y_correct))\r\n%%\r\nx = 666;\r\ny_correct = 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1;\r\nassert(isequal(isFactorion(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":379,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":83,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2014-08-08T15:54:48.000Z","updated_at":"2026-03-04T02:46:13.000Z","published_at":"2014-08-08T15:55:04.000Z","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\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"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\\n\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\u003eFrom Wikipedia:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eA factorion is a natural number that equals the sum of the factorials of its decimal digits\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFor example:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle 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?\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":2492,"title":"Factorions: Numbers that equal the sum of the factorials of their digits","description":"From Wikipedia: _A factorion is a natural number that equals the sum of the factorials of its decimal digits_\r\n\r\nFor example:\r\n\r\n2!=2\r\n\r\n1!+4!+5!=145\r\n\r\nWrite a function that returns true if a number is a factorion and false otherwise.\r\n\r\nAssume all numbers are of base 10.","description_html":"\u003cp\u003eFrom Wikipedia: \u003ci\u003eA factorion is a natural number that equals the sum of the factorials of its decimal digits\u003c/i\u003e\u003c/p\u003e\u003cp\u003eFor example:\u003c/p\u003e\u003cp\u003e2!=2\u003c/p\u003e\u003cp\u003e1!+4!+5!=145\u003c/p\u003e\u003cp\u003eWrite a function that returns true if a number is a factorion and false otherwise.\u003c/p\u003e\u003cp\u003eAssume all numbers are of base 10.\u003c/p\u003e","function_template":"function y = isFactorion(x)\r\n  y = num2str(x);\r\nend","test_suite":"%%\r\nx = 0;\r\ny_correct = 0;\r\nassert(isequal(isFactorion(x),y_correct))\r\n%%\r\nx = 1;\r\ny_correct = 1;\r\nassert(isequal(isFactorion(x),y_correct))\r\n%%\r\nx = 2;\r\ny_correct = 1;\r\nassert(isequal(isFactorion(x),y_correct))\r\n%%\r\nx = 145;\r\ny_correct = 1;\r\nassert(isequal(isFactorion(x),y_correct))\r\n%%\r\nx = 666;\r\ny_correct = 0;\r\nassert(isequal(isFactorion(x),y_correct))\r\n%%\r\nx = 1729;\r\ny_correct = 0;\r\nassert(isequal(isFactorion(x),y_correct))\r\n%%\r\nx = 40585;\r\ny_correct = 1;\r\nassert(isequal(isFactorion(x),y_correct))\r\n","published":true,"deleted":false,"likes_count":2,"comments_count":0,"created_by":379,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":83,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2014-08-08T15:54:48.000Z","updated_at":"2026-03-04T02:46:13.000Z","published_at":"2014-08-08T15:55:04.000Z","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\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"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\\n\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\u003eFrom Wikipedia:\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:rPr\u003e\u003cw:i/\u003e\u003c/w:rPr\u003e\u003cw:t\u003eA factorion is a natural number that equals the sum of the factorials of its decimal digits\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eFor example:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle 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?\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\"}]}"}],"errors":[],"facets":[[{"value":"Magic Numbers III","count":1,"selected":false}],[{"value":"easy","count":1,"selected":false}]],"term":"tag:\"factorion\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}