A093024 Indices of terms in A093019 with value 4.

3, 17, 22, 36, 41, 55, 60, 79, 84, 98, 102, 116, 121, 135, 140, 159, 164, 178, 183, 197, 201, 215, 220, 239, 244, 258, 263, 277, 282, 296, 300, 319, 324, 338, 343, 357, 362, 376, 381, 395, 404, 418, 423, 437, 442, 456, 461, 475, 480, 499, 507, 512, 526, 531

Offset

1,1

Comments

Integers which require a following 4 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)) = 4. - Reinhard Zumkeller, Nov 08 2014

Example

17 is in the sequence because A093019(17)=4; 174 has a valid Luhn mod 10 check digit.

Prog

(Haskell)
a093024 n = a093024_list !! (n-1)
a093024_list = filter ((== 4) . a093019) [0..]
-- Reinhard Zumkeller, Nov 08 2014

Crossrefs

Cf. A093017-A093029.

Sequence in context: A273448 A298469 A173579 * A109990 A019369 A019380

Adjacent sequences: A093021 A093022 A093023 * A093025 A093026 A093027

Keyword

easy,nonn,base

Author

Ray Chandler, Apr 03 2004

Extensions

Offset changed by Reinhard Zumkeller, Nov 08 2014

Status

approved