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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A096229 0*9, 1*8, 2*7, 3*6, 4*5; 10*19, 11*18, ..., 14*15; 20*29, 21*28, ..., 24*25; 30*39, ... 1
0, 8, 14, 18, 20, 190, 198, 204, 208, 210, 580, 588, 594, 598, 600, 1170, 1178, 1184, 1188, 1190, 1960, 1968, 1974, 1978, 1980, 2950, 2958, 2964, 2968, 2970, 4140, 4148, 4154, 4158, 4160, 5530, 5538, 5544, 5548, 5550, 7120, 7128, 7134, 7138, 7140, 8910 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..45.

FORMULA

a(n) = (floor(n/5)*10+(n mod 5)) * (floor(n,5)*10+9-(n mod 5)) - Colin Barker, Feb 21 2013

Empirical g.f.: -2*x*(15*x^9-x^8-2*x^7-3*x^6-4*x^5+85*x^4+x^3+2*x^2+3*x+4) / ((x-1)^3*(x^4+x^3+x^2+x+1)^2). [Colin Barker, Feb 21 2013]

EXAMPLE

0 = 9 * 0,

8 = 8 * 1,

190 = 19 * 10,

580 = 29 * 20 and so on

PROG

(PARI) A096229(n) = (n\5*10+n%5) * (n\5*10+9-n%5) \\ Colin Barker, Feb 21 2013

CROSSREFS

Sequence in context: A084021 A138666 A072835 * A231718 A212020 A283597

Adjacent sequences:  A096226 A096227 A096228 * A096230 A096231 A096232

KEYWORD

easy,nonn

AUTHOR

Odimar Fabeny, Jul 29 2004

EXTENSIONS

More terms from Atilla Bora (borabanana(AT)gmail.com), Apr 23 2006

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 December 5 17:42 EST 2019. Contains 329768 sequences. (Running on oeis4.)