The smallest positive number k such that the sum of the products of its digits when written in all bases 2 to n equals k, or -1 if no such number exists.

A376860

The smallest positive number k such that the sum of the products of its digits when written in all bases 2 to n equals k, or -1 if no such number exists.

Terms

    a(0) =1a(1) =2a(2) =-1a(3) =-1a(4) =9a(5) =48a(6) =25a(7) =118a(8) =86a(9) =72a(10) =72a(11) =258a(12) =708a(13) =308a(14) =396a(15) =273a(16) =6766a(17) =3386a(18) =1824a(19) =4488a(20) =4488a(21) =14061a(22) =14061a(23) =18270a(24) =8451a(25) =8451a(26) =570519a(27) =29502a(28) =203294a(29) =3628711

External references