Numbers k such that sum of the divisors d of k divides 1 + 2 + ... + k = k(k+1)/2.

Terms

a(0) =1a(1) =2a(2) =15a(3) =20a(4) =24a(5) =95a(6) =104a(7) =207a(8) =224a(9) =287a(10) =464a(11) =1023a(12) =1199a(13) =1952a(14) =4095a(15) =4607a(16) =8036a(17) =12095a(18) =15872a(19) =16895a(20) =19359a(21) =22932a(22) =23519a(23) =28799a(24) =45440a(25) =45695a(26) =54144a(27) =77375a(28) =101567a(29) =102024