Determine 2250
The day number is the serial number of the day in the relevant month (i.e., the number on 5 August 2016 is 5). The digit sum of the day is the sum of the values of all digits on the date of that day (i.e., the digit sum on 5 August 2016 is 5 + 8 + 2 + 0 + 1 + 6 = 22). A lucky day is one whose day number is equal to the digit of the day. Determine how many happy days there are in 2016 and which they are.
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