A093022 - OEIS

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

A093022

Indices of terms in A093019 with value 2.

1

4, 18, 23, 37, 42, 56, 61, 75, 80, 99, 103, 117, 122, 136, 141, 155, 160, 179, 184, 198, 202, 216, 221, 235, 240, 259, 264, 278, 283, 297, 301, 315, 320, 339, 344, 358, 363, 377, 382, 396, 400, 419, 424, 438, 443, 457, 462, 476, 481, 495, 508, 513, 527, 532

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Integers which require a following 2 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)) = 2. - Reinhard Zumkeller, Nov 08 2014

EXAMPLE

18 is in the sequence because A093019(18)=2; 182 has a valid Luhn mod 10 check digit.

PROG

(Haskell)

a093022 n = a093022_list !! (n-1)

a093022_list = filter ((== 2) . a093019) [0..]

-- Reinhard Zumkeller, Nov 08 2014

CROSSREFS

Cf. A093017-A093029.

Sequence in context: A230605 A201880 A022384 * A255409 A363052 A057342

Adjacent sequences: A093019 A093020 A093021 * A093023 A093024 A093025

KEYWORD

easy,nonn,base

AUTHOR

Ray Chandler, Apr 03 2004

EXTENSIONS

Offset changed by Reinhard Zumkeller, Nov 08 2014

STATUS

approved