OFFSET
1,1
COMMENTS
Alternatively, we could write n^10 < d(n)^21. The last odd number is a(10) = 15.
LINKS
T. D. Noe, Table of n, a(n) for n = 1..89 (complete sequence)
MATHEMATICA
t = {}; Do[If[n < DivisorSigma[0, n]^(21/10), AppendTo[t, n]], {n, 10^4}]; t
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
T. D. Noe, May 14 2013
STATUS
approved