OFFSET
1,1
COMMENTS
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
10584000 is a term since csigma(10584000) = 42653520 > 4 * 10584000.
MATHEMATICA
f[p_, e_] := (p^(e + 1) - 1)/(p - 1) - 1; s[1] = 1; s[n_] := Times @@ (f @@@ FactorInteger[n]); Select[Range[10^8], s[#] > 4*# &]
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Dec 28 2020
STATUS
approved