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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 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 August 17 21:09 EDT 2018. Contains 313817 sequences. (Running on oeis4.)