A067116 Floor(decimal concatenation of first n natural numbers/their sum).

1, 4, 20, 123, 823, 5878, 44091, 342935, 2743484, 224466889, 18705574106, 1582779347450, 135666801210013, 11757789438201155, 1028806575842601095, 90777050809641273099, 8069071183079224275500, 721969526907088487807963

Offset

1,2

Links

Harry J. Smith, Table of n, a(n) for n = 1..100

Example

a(6) = floor (123456 / 21) = 5878.

Mathematica

Table[Floor[FromDigits[Flatten[IntegerDigits/@Range[n]]]/Total[Range[n]]], {n, 20}] (* Harvey P. Dale, Jul 22 2022 *)

Prog

(PARI) digitsIn(x)= { local(d); if (x==0, return(1)); d=1 + log(x)\log(10); if (10^d == x, d++, if (10^(d-1) > x, d--)); return(d) } Concat(a, b)= { return(a*10^digitsIn(b) + b) } { c=0; s=0; for (n=1, 100, c=Concat(c, n); s+=n; write("b067116.txt", n, " ", floor(c/s)) ) } \\ Harry J. Smith, May 24 2010

Crossrefs

Sequence in context: A009351 A379202 A121553 * A347339 A067121 A002793

Adjacent sequences: A067113 A067114 A067115 * A067117 A067118 A067119

Keyword

easy,nonn,base

Author

Amarnath Murthy, Jan 08 2002

Extensions

More terms from several contributors

Edited by Charles R Greathouse IV, Apr 26 2010

Status

approved