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!)
A093020 Indices of terms in A093019 with value 0. 1
0, 19, 24, 38, 43, 57, 62, 76, 81, 95, 104, 118, 123, 137, 142, 156, 161, 175, 180, 199, 203, 217, 222, 236, 241, 255, 260, 279, 284, 298, 302, 316, 321, 335, 340, 359, 364, 378, 383, 397, 401, 415, 420, 439, 444, 458, 463, 477, 482, 496, 509, 514, 528, 533 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Integers which require a following 0 to have a valid Luhn mod 10 check digit.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

John Kilgo, Using the Luhn Algorithm, DotNetJohn.com.

Webopedia, Luhn formula

Wikipedia, Luhn algorithm

Index entries for sequences related to decimal expansion of n

FORMULA

A093019(a(n)) = 0. - Reinhard Zumkeller, Nov 08 2014

EXAMPLE

19 is in the sequence because A093019(19)=0; 190 has a valid Luhn mod 10 check digit.

PROG

(Haskell)

a093020 n = a093020_list !! (n-1)

a093020_list = filter ((== 0) . a093019) [0..]

-- Reinhard Zumkeller, Nov 08 2014

CROSSREFS

Cf. A093017-A093029.

Sequence in context: A160077 A076353 A297575 * A105504 A151900 A087951

Adjacent sequences: A093017 A093018 A093019 * A093021 A093022 A093023

KEYWORD

easy,nonn,base

AUTHOR

Ray Chandler, Apr 03 2004

EXTENSIONS

Offset changed by Reinhard Zumkeller, Nov 08 2014

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 December 1 22:55 EST 2022. Contains 358485 sequences. (Running on oeis4.)