a(n) contains n digits (either '4' or '5') and is divisible by 2^n.

A053315

a(n) contains n digits (either '4' or '5') and is divisible by 2^n.

Terms

    a(0) =4a(1) =44a(2) =544a(3) =4544a(4) =44544a(5) =444544a(6) =4444544a(7) =54444544a(8) =454444544a(9) =5454444544a(10) =45454444544a(11) =545454444544

External references