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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, DotNetJohn.com, Using the Luhn Algorithm Webopedia, Luhn formula Wikipedia, Luhn_algorithm 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: A088494 A109659 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

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