A093020 - OEIS

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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