https://iu.app.box.com/folder/95380573970 material folder

math folder https://iu.app.box.com/folder/42350104585

number thoery and counting

https://iu.box.com/s/qzw1rj2sdlj2to2s5v8o55a5nqsq68cj


  • if n has f(n) factors, then their product is n(f(n)/2)
  • Suppose n = p1m1 p2m2 p3m3 ... prmr
  • ● Then sum of the factors is
  • ● (1 + p11 + p12 + ... + p1m1)(1 + p21 + p22 + ... + p2m2) ... (1 + pr1 + pr2 + ... + prmr)