A093023 - OEIS

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A093023

Indices of terms in A093019 with value 3.

1

8, 13, 27, 32, 46, 51, 65, 70, 89, 94, 107, 112, 126, 131, 145, 150, 169, 174, 188, 193, 206, 211, 225, 230, 249, 254, 268, 273, 287, 292, 305, 310, 329, 334, 348, 353, 367, 372, 386, 391, 409, 414, 428, 433, 447, 452, 466, 471, 485, 490, 503, 517, 522, 536

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

OFFSET

1,1

COMMENTS

Integers which require a following 3 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)) = 3. - Reinhard Zumkeller, Nov 08 2014

EXAMPLE

13 is in the sequence because A093019(13)=3; 133 has a valid Luhn mod 10 check digit.

PROG

(Haskell)

a093023 n = a093023_list !! (n-1)

a093023_list = filter ((== 3) . a093019) [0..]

-- Reinhard Zumkeller, Nov 08 2014

CROSSREFS

Cf. A093017-A093029.

Sequence in context: A229446 A205704 A337212 * A057097 A246639 A287922

Adjacent sequences: A093020 A093021 A093022 * A093024 A093025 A093026

KEYWORD

easy,nonn,base

AUTHOR

Ray Chandler, Apr 03 2004

EXTENSIONS

Offset changed by Reinhard Zumkeller, Nov 08 2014

STATUS

approved