127

This number is a prime.

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127 = 1*prime(1) + 2*prime(2) + 7*prime(7). Note that 127 is the largest number with this property. There are only two such numbers, and both are primes. [Firoozbakht]

127 = prime(1*2*7) + (1*2*7) * π(1*2*7), and is the only known number with this property. [Firoozbakht]