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

Author

Gerasimov Sergey, Jan 02 2014

Keywords

• nonn

Comments

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

Examples

			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.
		

Links

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

Crossrefs

Cf. A231431 (evil squares).

Programs

Mathematica

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