Decode the logic and find the number for September

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

Decode the logic and find the number for September = ?

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If you can solve any 3 of these 5 puzzles, you have got a great IQ

• कोइ शादीशुदा भी इस मैसेज का जवाब नही दे सकते तो कवारे क्या दे पायेंगे?
• A young woman is attending her mother’s funeral
• Which one of the below image is different and why?
• How old were each at the sixth of these birthdays?
• ABCD is a 4 digit number