Least number with n preimages (or immediate predecessors) under f(n) = n + (product of nonzero digits of n).

A096347

Least number with n preimages (or immediate predecessors) under f(n) = n + (product of nonzero digits of n).

Terms

    a(0) =1a(1) =2a(2) =12a(3) =102a(4) =116a(5) =1098a(6) =2072a(7) =1014a(8) =101134a(9) =11014a(10) =1011098a(11) =1003525a(12) =41021255a(13) =210110985a(14) =403130555a(15) =481104655a(16) =4401225555a(17) =4811125555a(18) =86413249555a(19) =39011218055

External references