Start with any natural number, e.g. 24. 24=18*4/3 =16*3/2 =12*2 =8*3 =6*4 =4*6 =2*12 2,4,6,8,12,16,18=d, m=the other factor With the 1st Shalan theorem (d(m²-1)/2)²+d²m²=(d(m²+1)/2)² =(a+d)² you get 7²+24²=25² 10²+24²=26² 18²+24²=30² 32²+24²=40² 45²+24²=51² 70²+24²=74² 143²+24²=145²