A235001 Odious squares.

1, 4, 16, 25, 49, 64, 81, 100, 121, 196, 256, 289, 324, 361, 400, 484, 529, 625, 784, 841, 961, 1024, 1089, 1156, 1225, 1296, 1444, 1521, 1600, 1681, 1849, 1936, 2116, 2401, 2500, 2601, 3025, 3136, 3364, 3481, 3844, 4096, 4225, 4356, 4489, 4624, 4900, 5041, 5184, 5625

Offset

1,2

Comments

This sequence is the intersection of A000069 and A000290. Numbers n^2 such that A159918 is odd.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

16 is a square 4^2 and 16 in base 2 is a 10000, having an odd number of 1's, thus 16 is in this sequence.

Mathematica

Select[Range[200]^2, OddQ[DigitCount[#, 2, 1]]&] (* Harvey P. Dale, Jan 14 2014 *)

Crossrefs

Cf. A231431 (evil squares).

Sequence in context: A202303 A350835 A214937 * A087055 A135556 A163095

Adjacent sequences: A234998 A234999 A235000 * A235002 A235003 A235004

Keyword

nonn

Author

Gerasimov Sergey, Jan 02 2014

Status

approved