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Namely, if we take $198$ and its reversal $891$, which have prime factorizations $198 = 2\\cdot 3^2\\cdot 11$ and $891 = 3^4\\cdot 11$ respectively, and sum the numbers appearing in each factorization getting $2+3+2+11 = 18$ and $3+4+11 = 18$, both sums are $18$. Such numbers were later named $v$-palindromes because they can be viewed as an analogy to the usual palindromes. 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