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A047987
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Integers n such that A047988(n)=4.
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7
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3976733, 8053483, 9942523, 10197427, 15126557, 28623773, 32269037, 34438387, 36627413, 39593803, 47812747, 49120843, 55066867, 69909667, 78068443, 80024213, 83402597, 89512483, 97799033, 101652883, 106675637, 116621213, 120317683, 128241067
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OFFSET
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1,1
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REFERENCES
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Thomas Kantke, Mathematische Unterhaltungen, Spectrum der Wissenschaft, April 1993, pp. 11-13.
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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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Thomas Kantke (bytes.more(AT)ibm.net)
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EXTENSIONS
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STATUS
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approved
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