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a(n)=s(n)/12, where s=A033009.
1

%I #6 Feb 03 2014 12:13:19

%S 1,2,3,4,5,6,7,8,9,10,121,123,124,125,126,127,128,129,130,131,242,243,

%T 245,246,247,248,249,250,251,252,363,364,365,367,368,369,370,371,372,

%U 373,484,485,486,487,489,490,491,492,493,494

%N a(n)=s(n)/12, where s=A033009.

%o (PARI) is_A043315(n)=(n=[n])&&!until(!n[1],((n=divrem(n[1],121))[2]<11 && n[1]%11!=n[2])||return) \\ _M. F. Hasler_, Feb 03 2014

%Y Cf. A043307 - A043320, A043291, A033001 - A033014, A033016 - A033029.

%K nonn,base

%O 1,2

%A _Clark Kimberling_