%I #21 May 30 2023 07:43:48
%S 2241998,2250886,2264218,2268662,2286394,2290882,2295326,2295458,
%T 2308658,2309054,2313586,2330878,2335322,2336246,2340778,2354374,
%U 2357542,2361986,2375186,2375318,2377034,2381566,2384602,2398726
%N Composite numbers whose 4 prime factors are distinct in length.
%C Equivalently, the products of 4 prime numbers that have distinct lengths when written in decimal.  _Peter Munn_, May 30 2023
%e 2241998 because 2241998 = 2 * 11 * 101 * 1009, which have 1, 2, 3, and 4 digits, respectively.
%t Select[Range[24*10^5],PrimeNu[#]==4&&Length[Union[IntegerLength/@ FactorInteger[ #][[All,1]]]]==4&] (* _Harvey P. Dale_, Jan 12 2020 *)
%Y Subsequence of A046386.
%K nonn,base
%O 1,1
%A _Patrick De Geest_, Jul 15 1998
