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Search: id:A066685
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| A066685 |
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Numbers n such that p(n) is congruent to EulerPhi(n) mod n, where p(n) denotes the n-th prime. |
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OFFSET
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1,2
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EXAMPLE
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p(3) = 5 is congruent to sigma(3) = 2 mod 3; so 3 is a term of the sequence.
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MATHEMATICA
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Select[ Range[ 1, 10^6 ], Mod[ EulerPhi[ # ], # ] == Mod[ Prime[ # ], # ] & ]
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CROSSREFS
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Sequence in context: A090510 A004887 A108332 this_sequence A076155 A004898 A062920
Adjacent sequences: A066682 A066683 A066684 this_sequence A066686 A066687 A066688
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KEYWORD
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nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 11 2002
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