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https://doi.org/10.4169/amer.math.monthly.118.02.153
Copy DOIJournal: The American Mathematical Monthly | Publication Date: Feb 1, 2011 |
Citations: 11 |
Let k be a positive integer, and suppose that k = a1a2 … at, where ai is the ith digit of k (reading from left to right). Let d ∈ {0,1,…,9}. For n ≥ 1, defineIn this article, we examine when sn is composite for all n.
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