53
This number is a prime.
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The difference between the sum of unitary divisors and the value of the Euler-phi function is iterated, and started at n and a(n) is the length of terminal cycle of iteration involving a high-frequency of the prime number 53. [Labos]
Submitted: 2004-09-07 09:35:32; Last Modified: 2008-01-30 17:28:00.
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