login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A199988 Numbers whose product of digits is 6. 3
6, 16, 23, 32, 61, 116, 123, 132, 161, 213, 231, 312, 321, 611, 1116, 1123, 1132, 1161, 1213, 1231, 1312, 1321, 1611, 2113, 2131, 2311, 3112, 3121, 3211, 6111, 11116, 11123, 11132, 11161, 11213, 11231, 11312, 11321, 11611, 12113, 12131, 12311, 13112, 13121 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

f:= proc(d) local b, i, t;

   b:= (10^d-1)/9;

   op(sort([seq(b+5*10^i, i=0..d-1), seq(b+10^t[1]+2*10^t[2], t = combinat:-permute([$0..d-1], 2))]))

end proc:

seq(f(i), i=1..5); # Robert Israel, Jan 13 2021

MATHEMATICA

Select[Range[20000], Times @@ IntegerDigits[#] == 6 &] (* T. D. Noe, Nov 16 2011 *)

PROG

(Python)

from sympy import prod

from sympy.utilities.iterables import multiset_permutations

def agen(maxdigits):

    for digs in range(1, maxdigits+1):

        for mp in multiset_permutations("1"*(digs-1) + "236", digs):

            if prod(map(int, mp)) == 6: yield int("".join(mp))

print(list(agen(5))) # Michael S. Branicky, Jun 16 2021

CROSSREFS

Subsequence of A034053.

Cf. A007954.

Sequence in context: A340497 A051808 A034053 * A114222 A348229 A275641

Adjacent sequences:  A199985 A199986 A199987 * A199989 A199990 A199991

KEYWORD

nonn,look,base

AUTHOR

Jaroslav Krizek, Nov 13 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 23 23:42 EDT 2022. Contains 353993 sequences. (Running on oeis4.)