Numbers k such that sigma(k) = concat(s,t) and k = s * t, where sigma(k) is the sum of the divisors of k.

A272778

Numbers k such that sigma(k) = concat(s,t) and k = s * t, where sigma(k) is the sum of the divisors of k.

Terms

    a(0) =48a(1) =1040a(2) =1196a(3) =2720a(4) =6080a(5) =19080a(6) =116644a(7) =252800a(8) =796172a(9) =1014800a(10) =2370352a(11) =2796800a(12) =2864000a(13) =12200288a(14) =13499120a(15) =13716716a(16) =15252992a(17) =21938672a(18) =33883520a(19) =43218800a(20) =62496048a(21) =70240000a(22) =98392832a(23) =129704960a(24) =199361792a(25) =318836720a(26) =548444160a(27) =1218624080

External references