login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A096105 Numbers such that every digit is a multiple of the digit to its left. 2
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 24, 26, 28, 30, 33, 36, 39, 40, 44, 48, 50, 55, 60, 66, 70, 77, 80, 88, 90, 99, 100, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 122, 124, 126, 128, 130, 133, 136, 139, 140, 144, 148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The number of n-digit terms is (n^4+22n^3+95n^2+98n)/24. - David Wasserman

LINKS

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

MAPLE

for i from 1 to 9 do g(i):= [seq(t, t=0..9, i)] od: g(0):= [0]:

A[1]:= [$1..9]:

for d from 2 to 4 do A[d]:= map(t -> op(10*t+~g(t mod 10)), A[d-1]) od:

map(op, [seq(A[d], d=1..4)]); # Robert Israel, Sep 01 2019

CROSSREFS

Cf. A096106.

Sequence in context: A247756 A032520 A034837 * A178157 A246083 A246090

Adjacent sequences:  A096102 A096103 A096104 * A096106 A096107 A096108

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Jun 26 2004

EXTENSIONS

Edited by David Wasserman, Dec 28 2005

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 4 10:57 EDT 2020. Contains 335446 sequences. (Running on oeis4.)