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A235001 Odious squares. 7
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

Cf. A231431 (evil squares).

Sequence in context: A269157 A202303 A214937 * A087055 A135556 A163095

Adjacent sequences:  A234998 A234999 A235000 * A235002 A235003 A235004

KEYWORD

nonn

AUTHOR

Gerasimov Sergey, Jan 02 2014

STATUS

approved

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Last modified August 12 12:09 EDT 2020. Contains 336439 sequences. (Running on oeis4.)