OFFSET
1,1
REFERENCES
Conway, John H. and Guy, Richard K., The Book of Numbers, Copernicus, 1996, pp. 132-133.
Ore, Oystein, Number Theory and Its History, McGraw-Hill, 1948, (also reprinted 1988), pp. 50-52.
FORMULA
OMEGA(n) > log(n), where OMEGA is the total number of prime factors.
EXAMPLE
a(1) = 2 because 2 has 1 prime factor, viz., 2 and log(2) ~= 0.693 and 1 > 0.693.
4 is included because sum of exponents in prime factorization of 4 is 2, which is > log(4).
MATHEMATICA
Select[Range[2, 1100], Total[FactorInteger[#][[All, 2]]]>Log[#]&] (* Harvey P. Dale, Feb 04 2019 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Leroy Quet, Feb 05 2002
EXTENSIONS
More terms from Walter Nissen, Mar 10 2003
STATUS
approved