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A237522
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Numbers k such that phi(k) + sigma(k) = reversal(k) - 1.
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4
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OFFSET
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1,1
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COMMENTS
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a(4), if it exists, is larger than 10^13.
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LINKS
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EXAMPLE
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k = 165261124 is a term, because phi(k) = 67233600, sigma(k) = 353928960 and 67233600 + 353928960 = 421162561 - 1, where 421162561 is the reversal of 165261124.
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CROSSREFS
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KEYWORD
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base,nonn,bref,more
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AUTHOR
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STATUS
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approved
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