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A116453 Third smallest number with exactly n prime factors. 6
5, 9, 18, 36, 72, 144, 288, 576, 1152, 2304, 4608, 9216, 18432, 36864, 73728, 147456, 294912, 589824, 1179648, 2359296, 4718592, 9437184, 18874368, 37748736, 75497472, 150994944, 301989888, 603979776, 1207959552, 2415919104 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Smallest term in A116451 having exactly n prime factors;

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

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

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

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

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

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

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

CROSSREFS

Sequence in context: A110349 A036832 A257595 * A046578 A046590 A226663

Adjacent sequences:  A116450 A116451 A116452 * A116454 A116455 A116456

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Feb 16 2006

STATUS

approved

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Last modified May 26 19:44 EDT 2019. Contains 323597 sequences. (Running on oeis4.)