

A066684


Numbers n such that prime(n) is congruent to sigma(n) (mod n), where prime(n) denotes the nth prime.


0




OFFSET

1,2


COMMENTS

a(10) > 10^12. [From Donovan Johnson, Mar 14 2010]


LINKS

Table of n, a(n) for n=1..9.


EXAMPLE

prime(5)=11 is congruent to sigma(5)=6 (mod 5), so 5 is a term of the sequence.


MATHEMATICA

Select[ Range[ 1, 10^5 ], Mod[ DivisorSigma[ 1, # ], # ] == Mod[ Prime[ # ], # ] & ]


CROSSREFS

Sequence in context: A247963 A105288 A242915 * A328784 A128124 A182687
Adjacent sequences: A066681 A066682 A066683 * A066685 A066686 A066687


KEYWORD

nonn,hard,more


AUTHOR

Joseph L. Pe, Jan 11 2002


EXTENSIONS

a(9) from Donovan Johnson, Mar 14 2010


STATUS

approved



