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A130916 a(n) = smallest integer >= n which has only prime factors 2, 3 and 5. 3
1, 2, 3, 4, 5, 6, 8, 8, 9, 10, 12, 12, 15, 15, 15, 16, 18, 18, 20, 20, 24, 24, 24, 24, 25, 27, 27, 30, 30, 30, 32, 32, 36, 36, 36, 36, 40, 40, 40, 40, 45, 45, 45, 45, 45, 48, 48, 48, 50, 50, 54, 54, 54, 54, 60, 60, 60, 60, 60, 60, 64, 64, 64, 64, 72, 72, 72, 72, 72 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This group of sequences is useful when looking for a number >= n to use as the basis for a Fast Fourier Transform when you have n data points.

LINKS

Table of n, a(n) for n=1..69.

PROG

(R) f <- function(n) nextn(n, factors = c(2, 3, 5))

a <- matrix(1:256, ncol=1)

apply(a, 1, f)

CROSSREFS

Cf. A134361, A151969, A151970.

Sequence in context: A145518 A256221 A210253 * A003965 A214964 A097502

Adjacent sequences:  A130913 A130914 A130915 * A130917 A130918 A130919

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 23 2009

STATUS

approved

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Last modified June 27 16:18 EDT 2017. Contains 288790 sequences.