A002440 Squares written in base 7.

1, 4, 12, 22, 34, 51, 100, 121, 144, 202, 232, 264, 331, 400, 441, 514, 562, 642, 1024, 1111, 1200, 1261, 1354, 1452, 1552, 1654, 2061, 2200, 2311, 2424, 2542, 2662, 3114, 3241, 3400, 3531, 3664, 4132, 4302, 4444, 4621, 5100, 5251, 5434, 5622, 6112, 6304

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• base
• easy

Comments

Squares in base 10: 1, 4, 100, 121, 144, 400, 441, 1024, 10000, 10201, 10404, 12100, 12321, 12544, 14400, 14641. - Zak Seidov, Apr 18 2014

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. 93.

Links

• Zak Seidov, Table of n, a(n) for n = 1..1000

Programs

Mathematica

Table[FromDigits[IntegerDigits[n^2, 7]], {n, 100}] (* Zak Seidov, Apr 18 2014 *)

Formula

a(n) = A007093(A000290(n)). - Jason Kimberley, Dec 13 2012

Extensions

More terms from James Sellers, Sep 08 2000