Triangular numbers whose sum of aliquot divisors is a prime number.

Terms

a(0) =21a(1) =55a(2) =171a(3) =325a(4) =595a(5) =741a(6) =1081a(7) =1711a(8) =2485a(9) =3081a(10) =3655a(11) =7021a(12) =11325a(13) =13861a(14) =14365a(15) =15931a(16) =23005a(17) =23653a(18) =23871a(19) =29403a(20) =31375a(21) =32131a(22) =44551a(23) =45451a(24) =48205a(25) =52003a(26) =53301a(27) =60031a(28) =65341a(29) =65703