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

 

Logo

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A180513 Lunar squares n that can be written as n = i*i in more than one way. 4
111111111, 111111112, 111111113, 111111114, 111111115, 111111116, 111111117, 111111118, 111111119, 111111211, 111111222, 111111223, 111111224, 111111225, 111111226, 111111227, 111111228, 111111229, 111111311, 111111322, 111111333, 111111334, 111111335, 111111336, 111111337, 111111338, 111111339, 111111411, 111111422, 111111433, 111111444, 111111445, 111111446, 111111447, 111111448, 111111449, 111111511, 111111522 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 1..6561

D. Applegate, M. LeBrun and N. J. A. Sloane, Dismal Arithmetic [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]

EXAMPLE

11011*11011 = 11111*11111 = 111111111.

CROSSREFS

Cf. A087019, A181319.

Sequence in context: A165698 A158755 A094327 * A202174 A172525 A038451

Adjacent sequences:  A180510 A180511 A180512 * A180514 A180515 A180516

KEYWORD

nonn

AUTHOR

David Applegate, Marc LeBrun and N. J. A. Sloane, Jan 21 2011

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified August 19 02:24 EDT 2017. Contains 290794 sequences.