login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A194356 Triangle of divisors of 10^n, each number occurring once. 5

%I

%S 1,2,5,10,4,20,25,50,100,8,40,125,200,250,500,1000,16,80,400,625,1250,

%T 2000,2500,5000,10000,32,160,800,3125,4000,6250,12500,20000,25000,

%U 50000,100000,64,320,1600,8000,15625,31250,40000,62500,125000,200000,250000

%N Triangle of divisors of 10^n, each number occurring once.

%H T. D. Noe, <a href="/A194356/b194356.txt">Rows for n = 0..100</a>

%e The triangle has rows beginning with 2^k and ending with 10^k:

%e 1

%e 2, 4, 10

%e 4, 20, 25, 50, 100

%e 8, 40, 125, 200, 250, 500, 1000

%e 16, 80, 400, 625, 1250, 2000, 2500, 5000, 10000

%t Join[{{1}}, Table[Complement[Divisors[10^n], Divisors[10^(n-1)]], {n, 9}]]

%Y Cf. A194357 (divisors of 6^n), A194358 (divisors of 30^n).

%Y Cf. A003592 (numbers of the form 2^i*5^j).

%K nonn,tabf

%O 0,2

%A _T. D. Noe_, Aug 25 2011

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 November 13 10:50 EST 2019. Contains 329093 sequences. (Running on oeis4.)