January 713 February 823 Decipher the logic and Find the number for September

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decipher the logic and find the number for september
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Here is a list showing the month and a number for each month .
January 713
February 823
March 531
April 542
May 351
June 462
July 471
August 683

Decipher the logic and find the number for September = ?
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Please support yรถรผr answer by logic , it's compulsory ...๐Ÿ˜Ž

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September = 993
9 - September
9 - 9th Month
3 - No. of Vowels in September