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A078151
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Smallest x such that d[phi(x)]-phi[d(x)]=-n, where d()=A000005(),phi()=A000010(); restricted to cases when d[phi(x)]-phi[d(x)] is negative.
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0
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240, 120, 960, 6528, 4080, 1920, 15360, 24960, 61440, 13440, 16320, 87360, 983040, 196560, 1432080, 130560, 861840, 32640, 98280, 114240, 2545920, 293760, 261120, 967680, 174720, 2673216, 4194240, 1081080, 1044480, 913920, 1659840, 424320
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(77)=2970240, since d[phi(2970240)]-phi[d(2970240)]=-77 first appears here; while d[phi(x)]-phi[d(x)] takes large positive values,absolute value of negative differences grows significantly slower.
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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