A093022 Indices of terms in A093019 with value 2.

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

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