OFFSET
1,2
COMMENTS
EXAMPLE
a(7)= 13 because sigma(13)=14 and tau(13)= 2 so 14/2 = 7.
a(8)= 21 because sigma(21)=32 and tau(21)= 4 so 32/4 = 8.
MATHEMATICA
Table[SelectFirst[Range[10^3], n*DivisorSigma[0, #]==DivisorSigma[1, #]&], {n, 70}]/.(Missing["NotFound"]->0) (* Harvey P. Dale, Dec 14 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Claudio Meller, Jul 05 2009
EXTENSIONS
Edited by R. J. Mathar, Aug 07 2009
STATUS
approved