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Search: id:A066684
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| A066684 |
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Numbers n such that prime(n) is congruent to sigma(n) (mod n), where prime(n) denotes the n-th prime. |
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1
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OFFSET
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1,2
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EXAMPLE
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prime(5)=11 is congruent to sigma(5)=6 (mod 5), so 5 is a term of the sequence.
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MATHEMATICA
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Select[ Range[ 1, 10^5 ], Mod[ DivisorSigma[ 1, # ], # ] == Mod[ Prime[ # ], # ] & ]
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CROSSREFS
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Sequence in context: A036983 A126666 A056683 this_sequence A128124 A131806 A004518
Adjacent sequences: A066681 A066682 A066683 this_sequence A066685 A066686 A066687
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KEYWORD
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nonn,hard,more
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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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