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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A087019 Lunar squares: n*n where * is lunar multiplication (A087062). 10
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 100, 111, 112, 113, 114, 115, 116, 117, 118, 119, 200, 211, 222, 223, 224, 225, 226, 227, 228, 229, 300, 311, 322, 333, 334, 335, 336, 337, 338, 339, 400, 411, 422, 433, 444, 445, 446, 447, 448, 449, 500, 511, 522, 533, 544, 555, 556, 557, 558 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Sequence is not monotonic (1011*1011 = 1011111 > 1020*1020 = 1010200). In fact it even contains repetitions (11011*11011 = 11111*11111 = 111111111). See A172199. - N. J. A. Sloane, Dec 20 2010

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 0..10000

D. Applegate, C program for lunar arithmetic and number theory,  [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]

D. Applegate, M. LeBrun and N. J. A. Sloane, Dismal Arithmetic, arXiv:1107.1130 [math.NT], 2011. [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]

D. Applegate, M. LeBrun, N. J. A. Sloane, Dismal Arithmetic, J. Int. Seq. 14 (2011) # 11.9.8.

Brady Haran and N. J. A. Sloane, Primes on the Moon (Lunar Arithmetic), Numberphile video, Nov 2018.

Christian Woll, There is a 3X3 Magic Square of Squares on the Moon - A Lot of Them, Actually, arXiv:1811.04923 [math.HO], 2018.

Index entries for sequences related to dismal (or lunar) arithmetic

FORMULA

a(n)=A087062(n,n). - M. F. Hasler, Nov 15 2018

PROG

(PARI) apply( A087019(n)=A087062(n, n), [1..60]) \\ M. F. Hasler, Nov 15 2018

CROSSREFS

Cf. A087062 (lunar product), A087097 (lunar primes).

Cf. A172199, A180513, A181319, A087097.

Sequence in context: A218556 A043314 A088472 * A044911 A110734 A080436

Adjacent sequences:  A087016 A087017 A087018 * A087020 A087021 A087022

KEYWORD

nonn,base

AUTHOR

Marc LeBrun and N. J. A. Sloane, Oct 19 2003

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 April 25 12:04 EDT 2019. Contains 322456 sequences. (Running on oeis4.)