A095866 Largest n-digit number - largest n-digit triangular number.

3, 8, 9, 129, 318, 1008, 2843, 8988, 38439, 121089, 42708, 88208, 2034819, 1749819, 2235879, 104271309, 447194784, 1234742858, 2234186964, 3266133123, 22172578524, 114481278033, 204796672749, 841526085621, 355055477499

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Formula

a(n) = 10^n - 1 - A095864(n).

Mathematica

lndt[n_]:=Module[{c=Floor[(Sqrt[8*10^n+1]-1)/2]}, (c(c+1))/2]; Join[{3}, Table[ 10^n-1-lndt[n], {n, 2, 30}]] (* Harvey P. Dale, May 16 2017 *)

Crossrefs

Cf. A068092, A068093, A068094, A095863, A095864, A095865.

Sequence in context: A000927 A055513 A038226 * A067569 A127518 A176118

Adjacent sequences: A095863 A095864 A095865 * A095867 A095868 A095869

Keyword

base,easy,nonn

Author

Ray Chandler, Jun 28 2004

Status

approved