This site is supported by donations to The OEIS Foundation.

 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. 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.

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