A235001 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

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