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Search: id:A048868
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| A048868 |
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Numbers for which reduced residue system contains more primes than nonprimes. |
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+0
5
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| 8, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 84, 88, 90, 96, 98, 100, 102, 104, 108, 110, 112, 114, 120, 126, 130, 132, 138, 140, 144, 150, 154, 156, 160, 162, 168, 170
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OFFSET
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1,1
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EXAMPLE
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n=30 is the largest extremal example whose reduced residue system consists only of primes and 1 (see A048597); n=8 Phi(8)=4, reduced residue system (8)={1,3,5,7} n=32 Phi(32)=16, reduced residue system (32)={1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31} of which only {1,9,15,21,25,27} are not primes,10 are primes: 10>6 thus 32 belongs here.
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CROSSREFS
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A000720(n)-A001221(n) > A000010(n) - [ A000720(n)-A001221(n) ]
Sequence in context: A033198 A072900 A014453 this_sequence A106669 A108979 A107071
Adjacent sequences: A048865 A048866 A048867 this_sequence A048869 A048870 A048871
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu)
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