A093028 Indices of terms in A093019 with value 8.

1, 15, 20, 39, 44, 58, 63, 77, 82, 96, 100, 119, 124, 138, 143, 157, 162, 176, 181, 195, 204, 218, 223, 237, 242, 256, 261, 275, 280, 299, 303, 317, 322, 336, 341, 355, 360, 379, 384, 398, 402, 416, 421, 435, 440, 459, 464, 478, 483, 497, 505, 510, 529, 534

Offset

1,2

Comments

Integers which require a following 8 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)) = 8. - Reinhard Zumkeller, Nov 08 2014

Example

15 is in the sequence because A093019(15)=8; 158 has a valid Luhn mod 10 check digit.

Prog

(Haskell)
a093028 n = a093028_list !! (n-1)
a093028_list = filter ((== 8) . a093019) [0..]
-- Reinhard Zumkeller, Nov 08 2014

Crossrefs

Cf. A093017-A093029.

Sequence in context: A109659 A294149 A065148 * A105506 A120625 A038352

Adjacent sequences: A093025 A093026 A093027 * A093029 A093030 A093031

Keyword

easy,nonn,base

Author

Ray Chandler, Apr 03 2004

Extensions

Offset changed by Reinhard Zumkeller, Nov 08 2014

Status

approved