OFFSET
1,1
COMMENTS
Complement to A166546.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[300], DivisorSigma[0, DivisorSigma[0, #]+1]>2&] (* Harvey P. Dale, Jul 15 2021 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Apr 12 2010
EXTENSIONS
Extended by Giovanni Teofilatto, Apr 14 2010
Corrected (192 and 240 inserted) by R. J. Mathar, Apr 22 2010
STATUS
approved