Number x = concat(MSD(x),b) such that MSD(x)*b = d(x), where MSD(x) is the Most Significant Digit of x and d(x) is the number of divisors of x.

A291618

Number x = concat(MSD(x),b) such that MSD(x)*b = d(x), where MSD(x) is the Most Significant Digit of x and d(x) is the number of divisors of x.

Terms

    a(0) =14a(1) =22a(2) =24a(3) =32a(4) =42a(5) =202a(6) =402a(7) =1012a(8) =20008a(9) =30004a(10) =30008a(11) =80001a(12) =80002a(13) =100012a(14) =200008a(15) =300004a(16) =400001a(17) =400008a(18) =1000012a(19) =1000080a(20) =3000012a(21) =4000001a(22) =4000002a(23) =5000016a(24) =6000001a(25) =20000012a(26) =30000004a(27) =40000001a(28) =40000008a(29) =50000016

External references