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A116453 Third smallest number with exactly n prime factors. 6

%I

%S 5,9,18,36,72,144,288,576,1152,2304,4608,9216,18432,36864,73728,

%T 147456,294912,589824,1179648,2359296,4718592,9437184,18874368,

%U 37748736,75497472,150994944,301989888,603979776,1207959552,2415919104

%N Third smallest number with exactly n prime factors.

%C Smallest term in A116451 having exactly n prime factors;

%C a(n) = A116451(A116454(n)) = A116454(n) + 2 * n + 3;

%C a(n) = A005010(n-2) for n > 1.

%e a(1) = 5 = A000040(3) > A000040(2) = 3 > A000040(1) = 2;

%e a(2) = 9 = A001358(3) > A001358(2) = 6 > A001358(1) = 4;

%e a(3) = 18 = A014612(3) > A014612(2) = 12 > A014612(1) = 8;

%e a(4) = 36 = A014613(3) > A014613(2) = 24 > A014613(1) = 16.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Feb 16 2006

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Last modified June 18 14:52 EDT 2019. Contains 324213 sequences. (Running on oeis4.)