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A139392
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Odd noncyclic numbers; odd numbers n such that gcd(n,phi(n)) > 1.
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2
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9, 21, 25, 27, 39, 45, 49, 55, 57, 63, 75, 81, 93, 99, 105, 111, 117, 121, 125, 129, 135, 147, 153, 155, 165, 169, 171, 175, 183, 189, 195, 201, 203, 205, 207, 219, 225, 231, 237, 243, 245, 253, 261, 273, 275, 279, 285, 289, 291, 297, 301, 305, 309, 315, 325
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listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Sequence A060679 lists all noncyclic numbers, which includes all even numbers >2.
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LINKS
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MATHEMATICA
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Select[Range[1, 400, 2], GCD[ #, EulerPhi[ # ]]>1&]
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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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STATUS
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approved
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