74

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22796996699 is the 999799787th prime. Note that the sum of digits of the nth prime equals the sum of digits of n. The number 74 is the largest known digit sum with this property (as of August 2004). [Firoozbakht]

Submitted: 2004-08-28 12:45:20; Last Modified: 2014-08-30 15:16:45.