

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
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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



