A180513 Lunar squares n that can be written as n = i*i in more than one way.

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

Offset: 1

Author

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

Keywords

• nonn

Examples

			11011*11011 = 11111*11111 = 111111111.
		

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]

Crossrefs

Cf. A087019, A181319.