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# 70

This number is a composite.

The reversal of 2^{70} is prime. [Somer]

The prime formed from the reversal of 2^{70} has a digit sum of 70. [Patterson]

Any composite number *n* has a witness (i.e., does not pass Miller's test) less than 70(ln *n*)^2 if the Riemann hypothesis is true.

All the primes in the 70's are emirps. [Green]

(There is one curio for this number that has not yet been approved by an editor.)

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