login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A048346 a(n)^2 is the smallest square containing exactly n 1's in its decimal notation. 1
0, 1, 11, 109, 1054, 3381, 10541, 105414, 414139, 1055041, 10252371, 78173596, 334082481, 1187901979, 1055036071, 33333407869, 105409293239, 718412219489, 1054501356619, 10536182856619 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(20) > 10^14. - Giovanni Resta, Jul 27 2018

LINKS

Table of n, a(n) for n=0..19.

Eric Weisstein's World of Mathematics, Square Number

MATHEMATICA

a[n_] := Block[{k=0}, While[DigitCount[k^2, 10, 1] != n, k++]; k]; Array[a, 8, 0] (* Giovanni Resta, Jul 27 2018 *)

CROSSREFS

Cf. A036508, A034978.

Sequence in context: A159495 A125423 A165149 * A054320 A287836 A124290

Adjacent sequences:  A048343 A048344 A048345 * A048347 A048348 A048349

KEYWORD

nonn,base,more,changed

AUTHOR

Patrick De Geest, Mar 15 1999

EXTENSIONS

More terms from Jon E. Schoenfield, Jan 11 2009

Initial zero added by Zak Seidov, Nov 22 2010

a(17)-a(19) from Giovanni Resta, Jul 27 2018

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 13 18:57 EDT 2019. Contains 327981 sequences. (Running on oeis4.)