On twin EP numbers
EP numbers were introduced by Estrada and Pogliani in 2008. These are positive integers $E(n)$ defined as the product of $n$ and the sum of the digits of $n$. Estrada and Pogliani suspected that there may be infinitely many twin EP numbers; i.e. those pairs in this sequence that differ by one. It is...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Isfahan
2024-11-01
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| Series: | Transactions on Combinatorics |
| Subjects: | |
| Online Access: | https://toc.ui.ac.ir/article_28781_dc93c3e628e7d0c7006fe39e596c0e12.pdf |
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