A002441 Squares written in base 8. (Formerly M3408 N1378)

1, 4, 11, 20, 31, 44, 61, 100, 121, 144, 171, 220, 251, 304, 341, 400, 441, 504, 551, 620, 671, 744, 1021, 1100, 1161, 1244, 1331, 1420, 1511, 1604, 1701, 2000, 2101, 2204, 2311, 2420, 2531, 2644, 2761, 3100, 3221, 3344, 3471, 3620, 3751, 4104, 4241

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. 95.

Links

Table of n, a(n) for n=1..47.

Formula

a(n) = A007094(A000290(n)). - Jason Kimberley, Dec 13 2012

Mathematica

Table[BaseForm[n^2, 8], {n, 5!}] (* Vladimir Joseph Stephan Orlovsky, May 12 2010 *)
Table[FromDigits[IntegerDigits[n^2, 8]], {n, 60}] (* Vincenzo Librandi, Oct 15 2015 *)

Prog

(Magma) [Seqint(Intseq(n^2, 8)): n in [1..60]]; // Vincenzo Librandi, Oct 16 2015
(PARI) a(n)=fromdigits(digits(n^2, 8)) \\ Charles R Greathouse IV, Apr 25 2016

Crossrefs

Cf. A000290, A007094.

Sequence in context: A212460 A159801 A008245 * A301116 A008053 A301136

Adjacent sequences: A002438 A002439 A002440 * A002442 A002443 A002444

Keyword

nonn,easy,base

Author

N. J. A. Sloane

Extensions

More terms from James A. Sellers, Sep 08 2000

Status

approved