Active Elementary Number Theory:

  n2 + 1 and coprime increasing pairs
  of different parity

  JavaScript required
 sequence                                       
 a =  b =
 c =  d =
c,d both odd allowed
n = ac + bd
r = bd - ac
s = ad + bc
p = a2 + b2
q = c2 + d2
  © H.B. Meyer Seite in deutscher Sprache:        

eXTReMe Tracker