Triangular numbers whose sum of prime factors (with repetition) is also triangular.

Terms

a(0) =1a(1) =3a(2) =21a(3) =36a(4) =105a(5) =231a(6) =666a(7) =2080a(8) =2346a(9) =4186a(10) =5356a(11) =5886a(12) =6903a(13) =7140a(14) =7503a(15) =7875a(16) =9730a(17) =10296a(18) =16836a(19) =20301a(20) =21945a(21) =26106a(22) =28680a(23) =29646a(24) =33930a(25) =43660a(26) =46360a(27) =51040a(28) =52003a(29) =55611