1,1

Eric Weisstein's World of Mathematics, Heronian Triangle.

a(5) = 37: [37, A000040(37), A068968(5)] = [37,157,130], with s = (36+157+130)/2 = 162: Area^2 = s*(s-37)*(s-157)*(s-130) = 162*125*5*32 = 3240000 = 1800*1800, therefore A068969(5) = 1800.

Sequence in context: A027681 A097382 A003349 this_sequence A011195 A025195 A005552

Adjacent sequences: A068965 A068966 A068967 this_sequence A068969 A068970 A068971

nonn

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 30 2002