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+Over on YouTube, Michael Penn proves that the sum of reciprocals of the
+palindromes converges:
+
+\sum_{p \in PALIN} 1/p
+
+But he doesn’t compute the value to which the sum converges.
+
+Your task is to compute the infinite sum. When you are finished, you are welcome
+to read a suggested solution, or to post your own solution or discuss the
+exercise in the comments below.
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+https://programmingpraxis.com/2021/11/30/reciprocal-palindromes/