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Duodecimal Digits (Posted on 20110922) 

Determine the possible nonzero units digits of a duodecimal positive integer n such that:
Each of n and n+2 is a prime number, and:
n+2 is expressible as the sum of squares of two positive itegers.

Submitted by K Sengupta

Rating: 4.5000 (2 votes)


Solution:

(Hide)

The only possible digit is B.
For a detailed explanation, refer to the solution submitted by Math Man in this location.

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