# 739

This number is a prime.

The first Human Genome Project online download contained a 739 megabyte file.

The smallest prime number that is the sum of distinct primes beginning and ending with the digit three (739 = 3 + 353 + 383). [Capelle]

The only 3-digit prime (emirp) that remains prime when its leading digit is replaced by any digit that is equal to a power of 2, i.e., 1, 2, 4, 8. [Loungrides]

The smallest emirp that has a maximum product of digits for a prime sum of digits. [Loungrides]

(73*9) + (7*39) +/- 739 produces two prime numbers. [Homewood]

The start of five consecutive emirps in the sequence of Ulam primes, i.e., 739, 751, 983, 991, 1103. [Loungrides]

The smallest prime number that has both no digits in common with its square and the same sum of digits as its square. [Gaydos]

The number of the 8-star Odin in Tower of Saviors. [Luen]

7^39 is a 33-digit number without a 7 in it. Can you find a larger power of 7 without the digit 7 in it? [Loungrides]

739 is the largest prime used in Jean Brette's 31-digit approximation for π: ln[(2^5*5#*23*29)^3+739+5]/sqrt(163) = 3.141592653589793238462643383279... . [Rivera]

739 is at the end of a conveyor belt on the cover of
"The Prime Number Conspiracy: Biggest Ideas in Math from *Quanta." *

The smallest distinct-digit prime that is a sum of powers of its digits in more than one way: 739 = 7^0+3^2+9^3 = 7^0+3^6+9^1 = 7^1+3^1+9^3. [Vantieghem]

The sum of the squares of the digits of 739 is prime p. Note that p is π(739) plus the sum of the factorials of the digits of π(739). [Worrom]