Sum of divisors of k such that k and k+1 have the same number and sum of divisors.

Terms

a(0) =24a(1) =2160a(2) =2640a(3) =4320a(4) =51840a(5) =65280a(6) =115200a(7) =138240a(8) =194400a(9) =186048a(10) =276480a(11) =483840a(12) =622080a(13) =700416a(14) =950400a(15) =984960a(16) =1118880a(17) =1128960a(18) =1612800a(19) =2661120a(20) =3937248a(21) =3617280a(22) =5019840a(23) =6128640a(24) =5806080a(25) =7375680a(26) =8467200a(27) =11583936