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a(n+1) = a(n) + floor(a(n)/9) with a(0)=9.
1

%I #7 Feb 21 2015 14:21:47

%S 9,10,11,12,13,14,15,16,17,18,20,22,24,26,28,31,34,37,41,45,50,55,61,

%T 67,74,82,91,101,112,124,137,152,168,186,206,228,253,281,312,346,384,

%U 426,473,525,583,647,718,797,885,983,1092,1213,1347,1496,1662,1846

%N a(n+1) = a(n) + floor(a(n)/9) with a(0)=9.

%t NestList[#+Floor[#/9]&,9,60] (* _Harvey P. Dale_, Feb 21 2015 *)

%o (Python)

%o a=9

%o for i in range(55):

%o . print a,

%o . a += a/9

%Y Cf. A061418, A100585, A182305-A182308, A182361.

%K nonn

%O 0,1

%A _Alex Ratushnyak_, Apr 26 2012