(2*5^(2^n) + (10^n)/2 - 1) mod 10^n: a sequence of trimorphic numbers ending (for n > 1) in 9.
A224475
(2*5^(2^n) + (10^n)/2 - 1) mod 10^n: a sequence of trimorphic numbers ending (for n > 1) in 9.
Terms
- a(0) =4a(1) =99a(2) =749a(3) =6249a(4) =31249a(5) =281249a(6) =781249a(7) =75781249a(8) =925781249a(9) =1425781249a(10) =86425781249a(11) =336425781249
External references
- oeis: A224475