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A202277
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Numbers m such that number of integers k such sigma(k) <= m (A074753) is equal to number of integers k <= m such that sigma(x) = k has no solution (A202276).
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2
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2, 537, 639, 647, 653, 655, 657, 661, 663, 672, 674, 684, 686
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OFFSET
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1,1
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COMMENTS
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Conjecture: sequence is finite with 13 terms.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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