A083828 Let x(n) = 123...n, y(n) = n...321; c(n) = delete the LSD of y(n) and concatenated with x(n); d(n) = delete LSD of x(n) and concatenate with y(n). a(n) = c(n) - d(n).

0, 91, 19802, 3086913, 419758024, 53086469135, 6419753580246, 753086424691357, 86419753135802468, -13580245898641975411, -123580236689876419763310, -234580144678997654198553209, 7754320775431099224567922456892

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Example

x(3) = 123, y(3) = 321
c(3) = 32123, d(3) = 12321.
a(3) = c(3) - d(3) = 19802.

Prog

(PARI) { for(n=1, 20, if(n==1, x=1; y=1; l=1; ln=1; ln=length(Str(n)); x=x*10^ln+n; y=n*10^l+y; l=l+ln; ); print((floor(y/10)*10^l + x)-(floor(x/10)*10^l + y)); ); }

Crossrefs

Cf. A083827.

Sequence in context: A131442 A319370 A116507 * A348088 A157802 A214110

Adjacent sequences: A083825 A083826 A083827 * A083829 A083830 A083831

Keyword

base,easy,sign

Author

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 09 2003

Extensions

More terms from Ray Chandler, Jul 23 2003

Status

approved