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(4^4)^5 + (5^4)^4 is prime.
Note that (4^4)^5 = 1099511627776, and after adding (5^4)^4 we obtain our prime
number 1252099518401 which contains "09951" too!
Note also that 9951 = 31*321 and 123*13 = 1599. [Kulsha]
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