A002441 Squares written in base 8.

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

Author

N. J. A. Sloane

Keywords

• nonn
• easy
• base

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.

Crossrefs

Cf. A000290, A007094.

Programs

Magma

[Seqint(Intseq(n^2, 8)): n in [1..60]]; // Vincenzo Librandi, Oct 16 2015

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 *)

PARI

a(n)=fromdigits(digits(n^2,8)) \\ Charles R Greathouse IV, Apr 25 2016

Formula

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

Extensions

More terms from James Sellers, Sep 08 2000