Quote:
Originally Posted by GeeTwo
It has two prime factors: 1551037 and 6014357.
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For an arbitrary 13 digit number, its pretty unlikely to have only two prime factors and both 7 digits is even less likely. I'd suggest that these two numbers are worth further investigation.
Either the entire thing is a ruse and they chose the product of two relatively small primes just to lead to further useless lines of attack, or else the prime numbers are significant. Since its unlikely that the messages would directly encode into primes, maybe this:
1551037 = 117739th prime
6014357 = 413787th prime