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%I #15 Aug 26 2020 16:08:18
%S 0,12345679,24691358,37037037,49382716,61728395,74074074,86419753,
%T 98765432,111111111,123456790,135802469,148148148,160493827,172839506,
%U 185185185,197530864,209876543,222222222,234567901,246913580,259259259
%N 12345679n.
%C a(82)=1012345678 is the first term which has a digit appearing more than once without an obvious pattern, although a(-82)=-1012345678 might be seen as the concatenation of ten consecutive numbers.
%H Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H "TyYann", <a href="https://www.youtube.com/watch?v=P7Fbfu584ts">MegaFavNumbers: Lewis Carroll's Number</a>, video (2020)
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1).
%F a(n)=n*(10^(10-1)-1)/(10-1)^2
%t Table[12345679*n,{n,0,30}] (* or *) LinearRecurrence[{2,-1},{0,12345679},30] (* _Harvey P. Dale_, Oct 16 2015 *)
%o (PARI) a(n)=12345679*n \\ _Charles R Greathouse IV_, Jan 09 2012
%Y Cf. A027889, A057932, A060073.
%K base,easy,nonn
%O 0,2
%A _Henry Bottomley_, Apr 24 2002
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