|
|
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<m. Primitive elements of A147854: any element n of A147854 is of the form a(k)*s^2 for some positive integer s.
|
|
LINKS
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|