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1, 1, 1, 1, 1, 2, 1, 2, 2, 4, 1, 4, 1, 6, 5, 5, 1, 8, 1, 8, 7, 10, 1, 10, 4, 12, 7, 12, 1, 16, 1, 12, 11, 16, 9, 17, 1, 18, 13, 18, 1, 24, 1, 20, 17, 22, 1, 24, 6, 26, 17, 24, 1, 30, 13, 26, 19, 28, 1, 34, 1, 30, 23, 27, 15, 40, 1, 32
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refs;
listen;
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internal format)
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OFFSET
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1,6
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COMMENTS
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a(n) = number of nondivisors in the cototient of n, including 1. - Michael De Vlieger, Feb 25 2018
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LINKS
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FORMULA
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MATHEMATICA
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Table[Count[Range@ n, _?(And[! CoprimeQ[#, n], ! Divisible[n, #]] &)] + 1, {n, 68}] (* or *)
Array[2 + # - (DivisorSigma[0, #] + EulerPhi[#]) &, 68] (* Michael De Vlieger, Feb 25 2018 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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