|
|
A134361
|
|
a(n) = smallest integer >= n which has only prime factors 2 and 3.
|
|
4
|
|
|
1, 2, 3, 4, 6, 6, 8, 8, 9, 12, 12, 12, 16, 16, 16, 16, 18, 18, 24, 24, 24, 24, 24, 24, 27, 27, 27, 32, 32, 32, 32, 32, 36, 36, 36, 36, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 54, 54, 54, 54, 54, 54, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 72, 72, 72, 72, 72, 72, 72, 72
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
|
|
LINKS
|
|
|
MATHEMATICA
|
With[{pf23=Union[Flatten[Table[Times@@@Tuples[{2, 3}, n], {n, 0, 6}]]]}, Flatten[Table[Select[pf23, #>=n&, 1], {n, 80}]]] (* Harvey P. Dale, Mar 07 2012 *)
|
|
PROG
|
(R) f <- function(n) nextn(n, factors = c(2, 3))
a <- matrix(1:256, ncol=1)
apply(a, 1, f)
(PARI) a(n)=my(v=List()); for(i=0, logint(n, 3)+1, my(t=3^i); t<<=if(t>n, 0, exponent(n\t)+1); listput(v, t)); Set(v)[1] \\ Charles R Greathouse IV, Jul 09 2021
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|