A050084 a(n) = floor(a(n-1)/3) if this is not among 0, a(1), ..., a(n-2); otherwise a(n) = 5*a(n-1).

1, 5, 25, 8, 2, 10, 3, 15, 75, 375, 125, 41, 13, 4, 20, 6, 30, 150, 50, 16, 80, 26, 130, 43, 14, 70, 23, 7, 35, 11, 55, 18, 90, 450, 2250, 750, 250, 83, 27, 9, 45, 225, 1125, 5625, 1875, 625, 208, 69, 345, 115, 38, 12, 60, 300, 100, 33

Offset

1,2

Links

Ivan Neretin, Table of n, a(n) for n = 1..10000

Mathematica

Rest@Nest[Append[#, If[FreeQ[#, r = Quotient[#[[-1]], 3]], r, 5 #[[-1]]]] &, {0, 1}, 55] (* Ivan Neretin, Jul 31 2016 *)

Crossrefs

Cf. A050000 and references therein.

Sequence in context: A123748 A050108 A070386 * A070379 A143254 A070385

Adjacent sequences: A050081 A050082 A050083 * A050085 A050086 A050087

Keyword

nonn

Author

Clark Kimberling

Status

approved