Let x(1)x(2)... x(2q) denote the decimal expansion of a number n with an even number of digits. The sequence lists the numbers n such that (10^q-a)*(10^q-b) = n where a is the number having the digits x(1)x(2)...x(q) and b is the number having the digits x(q+1)x(q+2)...x(2q).
A245587
Let x(1)x(2)... x(2q) denote the decimal expansion of a number n with an even number of digits. The sequence lists the numbers n such that (10^q-a)*(10^q-b) = n where a is the number having the digits x(1)x(2)...x(q) and b is the number having the digits x(q+1)x(q+2)...x(2q).
Terms
- a(0) =18a(1) =35a(2) =50a(3) =1680a(4) =2664a(5) =3350a(6) =4130a(7) =5000a(8) =166800a(9) =251664a(10) =333500a(11) =401330a(12) =500000a(13) =16668000a(14) =25016664a(15) =33335000a(16) =40013330a(17) =50000000a(18) =1666680000a(19) =2500166664a(20) =3333350000a(21) =4000133330a(22) =5000000000a(23) =166666800000a(24) =250001666664a(25) =333333500000a(26) =400001333330a(27) =500000000000
External references
- oeis: A245587