OFFSET
1,1
COMMENTS
A137926(a(n)) is composite for all n.
MATHEMATICA
a = {}; For[n = 2, n < 1000, n++, b = Max[Select[Divisors[n], GCD[DivisorSigma[0, n], # ] == 1 &]]; If[b > 1 && ! PrimeQ[b], AppendTo[a, n]]]; a (* Stefan Steinerberger, Dec 06 2008 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Dec 04 2008
EXTENSIONS
More terms from Stefan Steinerberger and Ray Chandler, Dec 06 2008
STATUS
approved