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A prime such that its decimal period's length is shared with no other prime is called a unique prime (as defined by Yates in 1980). 3, 11, 37, and 101 are unique primes, since they are the only primes with periods one ( 1/3=.3333), two (1/11=.090909... ), three and four respectively.

List the first 15 unique primes, explaining how you obtained them.

Copying a list from OEIS does not qualify as a solution, getting information from any source is encouraged.

(No Solution Yet, 1 Comments) Submitted on 2017-11-24 by Ady TZIDON    


What digit is not included in the solution of the above alphametic?

(No Solution Yet, 1 Comments) Submitted on 2017-11-23 by Ady TZIDON    

Difficulty: 1 of 5 Way to go (in Riddles) Rating: 4.00
A mixture of 3/7 chicken, 2/3 cat, and 1/2 goat creates what?
(No Solution Yet, 2 Comments) Submitted on 2017-11-22 by Ady TZIDON    

The sum of the first N consecutive prime numbers is a zeroless pandigital. Find N and the corresponding 1-9 pandigital.
(No Solution Yet, 1 Comments) Submitted on 2017-11-21 by Ady TZIDON    

What starts with T, ends with T, and is full of T?
(No Solution Yet, 3 Comments) Submitted on 2017-11-20 by Ady TZIDON    

What is the answer to this alphametic?


(No Solution Yet, 0 Comments) Submitted on 2017-11-19 by Ady TZIDON    

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