OFFSET
1,1
EXAMPLE
All are special composites.
MATHEMATICA
sud[x_] := Apply[Plus, IntegerDigits[x]] Do[s=sud[n]-DivisorSigma[0, n]; If[s>0, Print[n]], {n, 1, 256}]
Select[Range[300], Total[IntegerDigits[#]]<DivisorSigma[0, #]&] (* Harvey P. Dale, Apr 05 2015 *)
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Labos Elemer, Sep 26 2002
STATUS
approved