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 A147856 Positive integers n such that n^2 = (x^4 - y^4)*(z^4 - t^4) where x>y and z>t are distinct pairs of integers with gcd(x,y)=gcd(z,t)=1. 3
 520, 975, 2040, 3567, 7215, 7800, 9840, 13920, 19680, 30160, 40545, 53040, 57720, 62985, 95120, 108225, 138040, 151320, 180960, 230880, 247520, 286200, 289952, 352495, 473280, 535353, 546975, 720945, 769600, 1048560, 1141920, 1210560 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Positive integers n such that n^2 = A147858(m)*A147858(k) for positive integers k

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Last modified December 10 20:48 EST 2019. Contains 329909 sequences. (Running on oeis4.)