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A330429
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Numbers k such that phi(k) = phi(k+9), where phi (A000010) is Euler's totient function.
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1
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9, 15, 1005079920836, 13695542245376, 26160864154416, 27402841561095, 27599063056565, 110263115897935, 124632211478775, 127400054266476, 154090744843026, 205849483744896, 231019991767556, 339938754880725, 459718637643265, 632733228632505, 646552697065275, 683008674773416, 884965354448175
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OFFSET
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1,1
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COMMENTS
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a(20) > 10^15.
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LINKS
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S. W. Graham, J. J. Holt, and C. Pomerance, On the solutions to phi(n) = phi(n+k), Number Theory in Progress, K. Gyory, H. Iwaniec, and J. Urbanowicz, eds., vol. 2, de Gruyter, Berlin and New York, 1999, pp. 867-882.
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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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