This site is supported by donations to The OEIS Foundation.

 Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A002442 Squares written in base 9. (Formerly M3377 N1361) 1
 1, 4, 10, 17, 27, 40, 54, 71, 100, 121, 144, 170, 207, 237, 270, 314, 351, 400, 441, 484, 540, 587, 647, 710, 764, 831, 1000, 1061, 1134, 1210, 1277, 1357, 1440, 1524, 1611, 1700, 1781, 1874, 2070, 2167, 2267, 2370, 2474, 2581, 2700, 2811, 3024, 3140, 3257 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). V. Thébault, Les Récréations Mathématiques. Gauthier-Villars, Paris, 1952, p. 98. LINKS Robert Israel, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A007095(A000290(n)). - Jason Kimberley, Dec 13 2012 MAPLE f:= proc(n) local L, i;   L:= convert(n^2, base, 9);   add(L[i]*10^(i-1), i=1..nops(L)) end proc: map(f, [\$1..100]); # Robert Israel, Aug 12 2018 MATHEMATICA Table[FromDigits[IntegerDigits[n^2, 9]], {n, 1, 100}] (* Stefan Steinerberger, Apr 11 2006 *) PROG (MAGMA) [Seqint(Intseq(n^2, 9)): n in [1..60]]; // Vincenzo Librandi, Oct 16 2015 (PARI) a(n) = fromdigits(digits(n^2, 9)); \\ Michel Marcus, Aug 13 2018 CROSSREFS Cf. A000290, A007095. Sequence in context: A294249 A138105 A213398 * A301253 A301195 A008022 Adjacent sequences:  A002439 A002440 A002441 * A002443 A002444 A002445 KEYWORD nonn,base,easy AUTHOR EXTENSIONS More terms from Stefan Steinerberger, Apr 11 2006 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 December 13 10:42 EST 2018. Contains 318086 sequences. (Running on oeis4.)