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A sequence goes 101, 10101, 1010101, 101010101, ...  How many numbers in this sequence are prime?

 Dec 6, 2019
 #1
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This is a bit of a trick question. Since, the sequence is infinite, there will be an infinite number of prime numbers. Math is weird.

 Dec 6, 2019
 #2
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Infinitely many. Only those with a prime number of occurence of '1's are primes.

 Dec 6, 2019

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