OFFSET
1,1
COMMENTS
a(n) is the unique positive integer less than 10^n such that 7a(n) - 1 is divisible by 10^n. - Eric M. Schmidt, Aug 18 2012
LINKS
Eric M. Schmidt, Table of n, a(n) for n = 1..1000
Eric Weisstein's World of Mathematics, Automorphic Number
Index entries for linear recurrences with constant coefficients, signature (11,-10,-1000,11000,-10000).
MATHEMATICA
LinearRecurrence[{11, -10, -1000, 11000, -10000}, {3, 43, 143, 7143, 57143}, 20] (* Harvey P. Dale, Apr 02 2018 *)
PROG
(Sage) [inverse_mod(7, 10^n) for n in range(1, 1001)] # Eric M. Schmidt, Aug 18 2012
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved