A093027 Indices of terms in A093019 with value 7.

6, 11, 25, 30, 49, 54, 68, 73, 87, 92, 105, 110, 129, 134, 148, 153, 167, 172, 186, 191, 209, 214, 228, 233, 247, 252, 266, 271, 285, 290, 308, 313, 327, 332, 346, 351, 365, 370, 389, 394, 407, 412, 426, 431, 445, 450, 469, 474, 488, 493, 501, 515, 520, 539

Offset

1,1

Comments

Integers which require a following 7 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)) = 7. - Reinhard Zumkeller, Nov 08 2014

Example

11 is in the sequence because A093019(11)=7; 117 has a valid Luhn mod 10 check digit.

Prog

(Haskell)
a093027 n = a093027_list !! (n-1)
a093027_list = filter ((== 7) . a093019) [0..]
-- Reinhard Zumkeller, Nov 08 2014

Crossrefs

Cf. A093017-A093029.

Sequence in context: A076496 A354594 A219628 * A109296 A158949 A061203

Adjacent sequences: A093024 A093025 A093026 * A093028 A093029 A093030

Keyword

easy,nonn,base

Author

Ray Chandler, Apr 03 2004

Extensions

Offset changed by Reinhard Zumkeller, Nov 08 2014

Status

approved