{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-06-25T00:23:38.000Z","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":"2026-06-25T00:00:00.000Z","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":44786,"title":"Lunar Arithmetic (Multiplication)","description":"\u003chttps://oeis.org/A087061 OEIS link for a description of lunar arithmetic\u003e\r\n\r\nSimply take the larger digit when adding and take the smaller digit when multiplying. \r\n\r\nExample \r\n\r\n        15866\r\n     X    147\r\n     _________\r\n        15766\r\n       14444\r\n    + 11111\r\n    __________\r\n      1145766","description_html":"\u003cp\u003e\u003ca href = \"https://oeis.org/A087061\"\u003eOEIS link for a description of lunar arithmetic\u003c/a\u003e\u003c/p\u003e\u003cp\u003eSimply take the larger digit when adding and take the smaller digit when multiplying.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cpre\u003e        15866\r\n     X    147\r\n     _________\r\n        15766\r\n       14444\r\n    + 11111\r\n    __________\r\n      1145766\u003c/pre\u003e","function_template":"function lunarMult = lunarMultiplication(x,y)\r\n  lunarMult = x * y\r\nend","test_suite":"\r\n\r\nfiletext = fileread('lunarMultiplication.m');\r\nassert(isempty(strfind(filetext, 'assert')))\r\nassert(isempty(strfind(filetext, 'echo')))\r\n\r\n%%\r\nx = 15866;\r\ny = 147;\r\nassert(isequal(lunarMultiplication(x,y),1145766))\r\n\r\n%%\r\nx = 169;\r\ny = 248;\r\nassert(isequal(lunarMultiplication(x,y),12468))\r\n\r\n%%\r\nx = 7;\r\ny = 4;\r\nassert(isequal(lunarMultiplication(x,y),4))\r\n\r\n\r\n%%\r\nx = 78;\r\ny = 4;\r\nassert(isequal(lunarMultiplication(x,y),44))\r\n\r\n\r\n%%\r\nx = 7799123;\r\ny = 109;\r\nassert(isequal(lunarMultiplication(x,y),117799123))","published":true,"deleted":false,"likes_count":5,"comments_count":0,"created_by":8703,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":50,"test_suite_updated_at":"2019-04-22T12:02:07.000Z","rescore_all_solutions":true,"group_id":1,"created_at":"2018-11-10T06:01:37.000Z","updated_at":"2026-05-24T13:12:04.000Z","published_at":"2018-11-10T06:01:37.000Z","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:hyperlink w:docLocation=\\\"https://oeis.org/A087061\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eOEIS link for a description of lunar arithmetic\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\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\u003eSimply take the larger digit when adding and take the smaller digit when multiplying.\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\u003eExample\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle 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arithmetic\u003e\r\n\r\nSimply take the larger digit when adding and take the smaller digit when multiplying. \r\n\r\nExample \r\n\r\n        15866\r\n     X    147\r\n     _________\r\n        15766\r\n       14444\r\n    + 11111\r\n    __________\r\n      1145766","description_html":"\u003cp\u003e\u003ca href = \"https://oeis.org/A087061\"\u003eOEIS link for a description of lunar arithmetic\u003c/a\u003e\u003c/p\u003e\u003cp\u003eSimply take the larger digit when adding and take the smaller digit when multiplying.\u003c/p\u003e\u003cp\u003eExample\u003c/p\u003e\u003cpre\u003e        15866\r\n     X    147\r\n     _________\r\n        15766\r\n       14444\r\n    + 11111\r\n    __________\r\n      1145766\u003c/pre\u003e","function_template":"function lunarMult = lunarMultiplication(x,y)\r\n  lunarMult = x * y\r\nend","test_suite":"\r\n\r\nfiletext = fileread('lunarMultiplication.m');\r\nassert(isempty(strfind(filetext, 'assert')))\r\nassert(isempty(strfind(filetext, 'echo')))\r\n\r\n%%\r\nx = 15866;\r\ny = 147;\r\nassert(isequal(lunarMultiplication(x,y),1145766))\r\n\r\n%%\r\nx = 169;\r\ny = 248;\r\nassert(isequal(lunarMultiplication(x,y),12468))\r\n\r\n%%\r\nx = 7;\r\ny = 4;\r\nassert(isequal(lunarMultiplication(x,y),4))\r\n\r\n\r\n%%\r\nx = 78;\r\ny = 4;\r\nassert(isequal(lunarMultiplication(x,y),44))\r\n\r\n\r\n%%\r\nx = 7799123;\r\ny = 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