Numbers n with the property that it is possible to write the base 2 expansion of n as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have (sigma(a)-a)*(sigma(b)-b) = sigma(n).

A259832

Numbers n with the property that it is possible to write the base 2 expansion of n as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have (sigma(a)-a)*(sigma(b)-b) = sigma(n).

Terms

    a(0) =7708a(1) =9020a(2) =86934a(3) =92128a(4) =120228a(5) =325180a(6) =372000a(7) =491630a(8) =565724a(9) =739032a(10) =862780a(11) =1120024a(12) =1344090a(13) =1419304a(14) =1440858a(15) =1678232a(16) =2752626a(17) =2980515a(18) =3684344a(19) =4154418a(20) =4860476a(21) =7539610a(22) =7565257a(23) =9527064a(24) =11025372a(25) =12277728a(26) =17002336a(27) =20256672a(28) =22528536a(29) =24597984

External references