A151970 a(n) = smallest integer >= n which has only prime factors 3 and 5.

1, 3, 3, 5, 5, 9, 9, 9, 9, 15, 15, 15, 15, 15, 15, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 27, 27, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75

Offset

1,2

Links

Table of n, a(n) for n=1..72.

Prog

(R) f <- function(n) nextn(n, factors = c(3, 5))
a <- matrix(1:256, ncol=1)
apply(a, 1, f)

Crossrefs

Cf. A130916, A134361, A151969.

Sequence in context: A275369 A377984 A062130 * A049644 A147472 A146914

Adjacent sequences: A151967 A151968 A151969 * A151971 A151972 A151973

Keyword

nonn

Author

N. J. A. Sloane, Aug 23 2009; corrected Mar 07 2012

Status

approved