The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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. LINKS 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 28 23:26 EDT 2021. Contains 346340 sequences. (Running on oeis4.)