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 A145828 Squares in A145768 (XOR of squares of the numbers 1...n). 4
 0, 1, 16, 1, 225, 0, 256, 400, 961, 256, 2401, 4225, 50176, 9216, 9216, 113569, 20736, 518400, 160000, 893025, 390625, 861184, 685584, 134689, 861184, 3568321, 389376, 6806881, 12730624, 12730624, 4260096, 105534529 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Chai Wah Wu, Table of n, a(n) for n = 1..97 MATHEMATICA Reap[For[Sow[x=0]; k=1, k <= 10^4, k++, x = BitXor[x, k^2]; If[IntegerQ[ Sqrt[x]], Sow[x]]]][[2, 1]] (* Jean-François Alcover, Nov 25 2015 *) PROG (PARI) an=0; for( i=1, 10^4, an=bitxor(an, i^2); issquare(an) && print1(an", ")) (Python) from gmpy2 import is_square filter(is_square, [reduce(lambda x, y:x^y, [x**2 for x in range(n)]) for n in range(1, 10**4)]) # Chai Wah Wu, Aug 05 2014 (PARI) {a(n) = my(x, m, k); while( m

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Last modified August 4 17:35 EDT 2024. Contains 374923 sequences. (Running on oeis4.)