OFFSET
0,1
COMMENTS
The quadratics in X, X^2 - S*X -+ P, where S=A020882(n), P=A057229(n) are each factorizable into two factors, all four being distinct: X^2 - S*X - P = (X - a)*(X + b). X^2 - S*X + P = (X - x)*(X - y). - Lekraj Beedassy, Apr 30 2004
Areas of primitive Pythagorean triangles sorted on hypotenuse A020882, then on perimeter A093507. - Lekraj Beedassy, Aug 18 2006
LINKS
P. Yiu, Factorizable x^2 + px -+ q, Recreational Mathematics, pp. 58/360.
EXAMPLE
E.g. a(1)=6=6*1=3*2, (6-1)=(3+2)=5=A020882(1), gcd(6,1)=gcd(3,2)=1
CROSSREFS
KEYWORD
nonn
AUTHOR
Naohiro Nomoto, Sep 19 2000
STATUS
approved