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A093029 Indices of terms in A093019 with value 9. 13
5, 10, 29, 34, 48, 53, 67, 72, 86, 91, 109, 114, 128, 133, 147, 152, 166, 171, 185, 190, 208, 213, 227, 232, 246, 251, 265, 270, 289, 294, 307, 312, 326, 331, 345, 350, 369, 374, 388, 393, 406, 411, 425, 430, 449, 454, 468, 473, 487, 492, 500, 519, 524, 538 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Integers which require a following 9 to have a valid Luhn mod 10 check digit.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

John Kilgo, DotNetJohn.com, Using the Luhn Algorithm

Webopedia, Luhn formula

Wikipedia, Luhn algorithm

Index entries for sequences related to decimal expansion of n

-

FORMULA

A093019(a(n)) = 9. - Reinhard Zumkeller, Nov 08 2014

EXAMPLE

10 is in the sequence because A093019(10)=9; 109 has a valid Luhn mod 10 check digit.

PROG

(Haskell)

a093029 n = a093029_list !! (n-1)

a093029_list = filter ((== 9) . a093019) [0..]

-- Reinhard Zumkeller, Nov 08 2014

CROSSREFS

Cf. A093017-A093028.

Sequence in context: A240515 A105862 A338662 * A105505 A005514 A069921

Adjacent sequences:  A093026 A093027 A093028 * A093030 A093031 A093032

KEYWORD

easy,nonn,base

AUTHOR

Ray Chandler, Apr 03 2004

EXTENSIONS

Offset changed by Reinhard Zumkeller, Nov 08 2014

STATUS

approved

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Last modified June 18 22:37 EDT 2021. Contains 345125 sequences. (Running on oeis4.)