A090760 - OEIS

%I #4 Mar 30 2012 19:01:05

%S 27,49,51,53,89,91,97,101,168,169,181,193,195,240,264

%N Numbers n which occur exactly three times in A001600.

%D T. Goto and S. Shibata, All numbers whose positive divisors have integral harmonic mean up to 300, Math. Comput. 73 (2004), 475-491.

%Y Cf. A001600, A090240.

%K nonn,more

%O 1,1

%A _R. K. Guy_, Feb 08 2004