|
| |
|
|
A127422
|
|
Numbers whose decimal expansion is a concatenation of 3 consecutive increasing numbers.
|
|
0
| |
|
|
12, 123, 234, 345, 456, 567, 678, 789, 8910, 91011, 101112, 111213, 121314, 131415, 141516, 151617, 161718, 171819, 202122, 212223, 222324, 232425, 242526, 252627
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
FORMULA
| a(n)=(n-1)*10^floor[log10(b)+1]+b, with b=n*10^floor[log10(n+1)+1]+n+1 and n>=1 [From Paolo P. Lava (paoloplava(AT)gmail.com), Aug 04 2008]
|
|
|
MAPLE
| (Maple) P:=proc(i) local a, b, c, n; for n from 1 by 1 to i do b:=n*10^evalf(floor(log10(n+1)+1))+n+1; a:=floor((n-1)*10^evalf(floor(log10(b)+1))+b); print(a); od; end: P(1000); [From Paolo P. Lava (paoloplava(AT)gmail.com), Aug 04 2008]
|
|
|
CROSSREFS
| Essentially the same as A001703.
Cf. A127421-A127430.
Sequence in context: A199592 A078189 A167208 * A163574 A079847 A144165
Adjacent sequences: A127419 A127420 A127421 * A127423 A127424 A127425
|
|
|
KEYWORD
| nonn,base
|
|
|
AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Jan 14 2007
|
| |
|
|
