A093028 - OEIS

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A093028

Indices of terms in A093019 with value 8.

2

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

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

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