Central polygonal numbers that are nontrivially the product of two central polygonal numbers.

Terms

a(0) =21a(1) =91a(2) =273a(3) =651a(4) =931a(5) =1333a(6) =2451a(7) =3783a(8) =4161a(9) =4557a(10) =6643a(11) =10101a(12) =14763a(13) =20881a(14) =22351a(15) =28731a(16) =31863a(17) =38613a(18) =50851a(19) =52671a(20) =65793a(21) =83811a(22) =99541a(23) =105301a(24) =130683a(25) =139503a(26) =160401a(27) =194923a(28) =221371a(29) =234741