OFFSET
0,2
COMMENTS
For n > 0, a(n) is the smallest number m having exactly n distinct prime divisors and exactly 2*n - 1 prime divisors counted with multiplicity.
LINKS
EXAMPLE
a(1) = 2^1;
a(2) = 2^2*3;
a(3) = 2^3*3*5;
a(4) = 2^4*3*5*7;
a(5) = 2^5*3*5*7*11, etc.
MATHEMATICA
Join[{1}, Table[2^(n - 1) Product[Prime[j], {j, n}], {n, 18}]]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 26 2018
STATUS
approved