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A037172
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Numbers n such that sigma(n) - n = {number of primes <= n}.
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2
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1, 2, 9, 85, 2569, 2723, 2807, 174449, 1302379, 8513821, 10518107, 14348051, 70110091, 70111621, 70112369, 10910880311, 43908943297, 4224496855063
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OFFSET
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1,2
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LINKS
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PROG
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(PARI) isok(n) = (sigma(n)-n == primepi(n)) \\ Michel Marcus, Jul 14 2013
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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More terms from Kok Seng Chua (chuaks(AT)ihpc.nus.edu.sg), Apr 09 2002
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STATUS
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approved
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