%I A087744
%S A087744 11,102,113,1004,1015,1106,1117,10008,10019,101010,101111,110012,110113,
%T A087744 111014,111115,1000016,1000117,1001018,1001119,1010020,1010121,1011022,
%U A087744 1011123,1100024,1100125,1101026,1101127,1110028,1110129
%N A087744 Binary and decimal representation of n concatenated.
%C A087744 The range of the sequence is generated by the context-sensitive grammar 
               with decimal digits as terminals, {s,x,y,z,c,u,v,L,R} as non-terminals, 
               s as axiom and the following rules (e is the empty word): s->L1xy1R, 
               L->e, R->e, xy->e, 0x->1u, 1x->x0, Lx->L1u, u1->1u, u0->0u, uy->uz, 
               zi->iz for 0<=i<=9, ziR->vjR for j=i+1 and 0<=i<9, z9R->c0R, ic->
               vj for j=i+1 and 0<=i<9, 9c->c0, iv->vi for 0<=i<=9, uv->xy and uc->
               xy1.
%Y A087744 Cf. A007088.
%Y A087744 Sequence in context: A103992 A001387 A100580 this_sequence A054421 A037700 
               A037609
%Y A087744 Adjacent sequences: A087741 A087742 A087743 this_sequence A087745 A087746 
               A087747
%K A087744 nonn,base
%O A087744 1,1
%A A087744 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 02 2003