|
| |
|
|
A019550
|
|
n followed by 2n.
|
|
1
| |
|
|
12, 24, 36, 48, 510, 612, 714, 816, 918, 1020, 1122, 1224, 1326, 1428, 1530, 1632, 1734, 1836, 1938, 2040, 2142, 2244, 2346, 2448, 2550, 2652, 2754, 2856, 2958, 3060, 3162, 3264, 3366, 3468, 3570, 3672, 3774, 3876, 3978, 4080
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,1
|
|
|
COMMENTS
| Concatenation of digits of n and 2*n. [From Harvey P. Dale, Sep 13 2011]
|
|
|
REFERENCES
| Sylvester Smith, "A Set of Conjectures on Smarandache Sequences", Bulletin of Pure and Applied Sciences, (Bombay, India), Vol. 15 E (No. 1), 1996, pp. 101-107.
|
|
|
LINKS
| M. L. Perez et al., eds., Smarandache Notions Journal
|
|
|
FORMULA
| a(n)=n*10^floor[log10(2*n)+1]+2*n, with n>=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Mar 24 2010]
|
|
|
MATHEMATICA
| nxt[n_]:=Module[{idn=IntegerDigits[n], idn2=IntegerDigits[2n]}, FromDigits[ Join[ idn, idn2]]]; Array[nxt, 40] (* From Harvey P. Dale, Sep 13 2011 *)
|
|
|
CROSSREFS
| Sequence in context: A140470 A141766 A069056 * A117304 A022759 A091193
Adjacent sequences: A019547 A019548 A019549 * A019551 A019552 A019553
|
|
|
KEYWORD
| nonn,base
|
|
|
AUTHOR
| R. Muller
|
| |
|
|
