

A087744


Binary and decimal representation of n concatenated.


0



11, 102, 113, 1004, 1015, 1106, 1117, 10008, 10019, 101010, 101111, 110012, 110113, 111014, 111115, 1000016, 1000117, 1001018, 1001119, 1010020, 1010121, 1011022, 1011123, 1100024, 1100125, 1101026, 1101127, 1110028, 1110129
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OFFSET

1,1


COMMENTS

The range of the sequence is generated by the contextsensitive grammar with decimal digits as terminals, {s,x,y,z,c,u,v,L,R} as nonterminals, 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.


LINKS

Table of n, a(n) for n=1..29.


MATHEMATICA

Table[FromDigits[Join[IntegerDigits[n, 2], IntegerDigits[n]]], {n, 30}] (* Harvey P. Dale, Dec 13 2011 *)


CROSSREFS

Cf. A007088.
Sequence in context: A180280 A100580 A253631 * A054421 A037700 A037609
Adjacent sequences: A087741 A087742 A087743 * A087745 A087746 A087747


KEYWORD

nonn,base


AUTHOR

Reinhard Zumkeller, Oct 02 2003


STATUS

approved



