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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A087392 a(1) = 1, a(n) = smallest multiple of n beginning with the digit reversal of a(n-1). 0
1, 10, 12, 212, 2120, 2124, 42126, 621240, 421263, 3621240, 4212637, 73621248, 842126376, 67362124802, 2084212637610, 16736212480208, 802084212637617, 7167362124802086, 680208421263761709, 9071673621248020860 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

FORMULA

a(n) = n*ceiling((1/n)*reverse(a(n-1))*10^f(n)) where f(n) starts out practically always 1 or 2 and reaches higher values extremely slowly. - Sam Alexander, Nov 15 2003

EXAMPLE

a(6) = 2124; a(7) = 42126, which begins with the digit reversal of 2124.

CROSSREFS

Sequence in context: A219213 A078217 A178639 * A255534 A262422 A248336

Adjacent sequences: A087389 A087390 A087391 * A087393 A087394 A087395

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Sep 09 2003

EXTENSIONS

More terms from Sam Alexander, Nov 15 2003

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 November 30 08:01 EST 2022. Contains 358435 sequences. (Running on oeis4.)