OFFSET
0,2
COMMENTS
It is believed that in all of such quadruples remainder 3 always arises.
EXAMPLE
n=241: sigma-s for {241,242,243,244} are {242,399,364,434}
whose remainders modulo 6 are {2,3,4,2}.
MATHEMATICA
SequencePosition[Table[If[Divisible[DivisorSigma[1, n], 6], 0, 1], {n, 12*10^5}], {1, 1, 1, 1}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Oct 21 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Aug 23 2004
EXTENSIONS
Definition rephrased by Harvey P. Dale, Oct 21 2017
STATUS
approved