OFFSET
1,1
COMMENTS
REFERENCES
Melvyn B. Nathanson, Elementary Methods in Number Theory, Springer, 2000, p 260.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from T. D. Noe)
MATHEMATICA
Select[Range[1000000], DivisorSigma[1, #] >= 4*#&] (* Vladimir Joseph Stephan Orlovsky, Apr 21 2010 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved