

A105869


Numbers k such that sigma(k) == 10 (mod k).


0




OFFSET

1,2


COMMENTS

9671406556892844141838336 is a term (as are all numbers of the form 2^(j1)*(2^j  11) where 2^j  11 is prime).  Jon E. Schoenfield, Jun 02 2019


LINKS



EXAMPLE

Sigma(40) = 90 == 10 (mod 40).


MATHEMATICA

Join[{1}, Select[Range[600000], Mod[DivisorSigma[1, #], #]==10 &]] (* Vincenzo Librandi, Mar 11 2014 *)


CROSSREFS



KEYWORD

more,nonn


AUTHOR



EXTENSIONS



STATUS

approved



