January 100 February 233 find the Number for September October November and December

Here is a list showing the month and a number for each month .

January 100
February 233
March. 334
April. 460
May. 512
June. 645
July. 760
August. 823

Decipher the logic and find the number for September October November & December = ?

This is O P E N for all

Please support yöür answer with the logic , it’s compulsory.