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) = n.

A259831

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) = n.

Terms

    a(0) =216a(1) =13296a(2) =13464a(3) =14416a(4) =51480a(5) =235200a(6) =575484a(7) =578592a(8) =585000a(9) =1032656a(10) =1121400a(11) =1599552a(12) =4190364a(13) =4786110a(14) =8365968a(15) =11268688a(16) =13010634a(17) =13253436a(18) =21835624a(19) =22108784a(20) =23896320a(21) =136311840a(22) =152820243a(23) =160380496a(24) =170073324a(25) =295999900a(26) =421686580a(27) =445421664

External references