login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A173906 Total number of digits of the squares of all n-digit numbers. 0
16, 338, 5183, 69837, 878377, 10583772, 123837722, 1418377223, 15983772233, 177837722339, 1958377223398, 21383772233983, 231837722339831, 2498377223398316, 26783772233983162, 285837722339831620, 3038377223398316206, 32183772233983162066, 339837722339831620668, 3578377223398316206680 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Sequence inspired by Claudio Meller's email to [seqfan] 07:01 a.m., Nov 26 2010, subject: About a problem of Bernardo Recamán Santos found in http://www.mathpuzzle.com/
LINKS
FORMULA
As n -> infinity, a(n)/(n*10^(n+floor(log(log(n))+1)) -> 9/50.
MATHEMATICA
f[n_] := Block[{br = 1+ Floor[10^(n-1)*Sqrt@10]}, (2n-1)(br-10^(n-1)) + 2n(10^n-br)]; Array[f, 20]
CROSSREFS
Cf. A000290.
Sequence in context: A058722 A318013 A320399 * A227102 A221577 A363383
KEYWORD
nonn,base
AUTHOR
Robert G. Wilson v, Nov 26 2010
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 13 17:26 EDT 2024. Contains 371644 sequences. (Running on oeis4.)