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!)
A159021 a(0)=19; a(n) = a(n-1) + floor(sqrt(a(n-1))), n > 0. 1
19, 23, 27, 32, 37, 43, 49, 56, 63, 70, 78, 86, 95, 104, 114, 124, 135, 146, 158, 170, 183, 196, 210, 224, 238, 253, 268, 284, 300, 317, 334, 352, 370, 389, 408, 428, 448, 469, 490, 512, 534, 557, 580, 604, 628, 653, 678, 704, 730, 757, 784, 812, 840, 868, 897, 926, 956, 986, 1017 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
COMMENTS
Row 3 in square array A159016.
This sequence contains infinitely many squares. - Philippe Deléham, Apr 04 2009
Conjecture: The squares are of the form (7*2^k)^2 (see A005009). - Vincenzo Librandi, Apr 10 2009
LINKS
MATHEMATICA
NestList[#+Floor[Sqrt[#]]&, 19, 60] (* Harvey P. Dale, Jan 04 2013 *)
CROSSREFS
Sequence in context: A317254 A226687 A070299 * A100460 A166061 A224534
KEYWORD
nonn
AUTHOR
Philippe Deléham, Apr 02 2009
EXTENSIONS
More terms from Vincenzo Librandi, Apr 10 2009
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 March 28 15:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)