A323727 Number of 1's required to build n using +, -, *, ^ and tetration.

1, 2, 3, 4, 5, 5, 6, 5, 5, 6, 7, 7, 8, 7, 6, 5, 6, 7, 8, 8, 9, 9, 9, 8, 7, 6, 5, 6, 7, 8, 8, 7, 8, 9, 8, 7, 8, 9, 10, 10, 11, 11, 10, 11, 10, 10, 9, 8, 8, 9, 10, 9, 8, 7, 8, 9, 10, 10, 11, 11, 10, 9, 8, 7, 8, 9, 10, 11, 11, 10, 10, 9, 10, 10, 10, 11, 11, 10, 9

Offset

1,2

Links

Table of n, a(n) for n=1..79.

Wikipedia, Tetration

Index to sequences related to the complexity of n

Example

a(14) = 7 because 14 = (1+1)^^(1+1+1)-1-1. (Note that 14 is also the smallest index at which this sequence differs from A091334.)

Crossrefs

Cf. A091333, A091334, A025280.

Sequence in context: A362471 A154940 A133344 * A348089 A091334 A306560

Adjacent sequences: A323724 A323725 A323726 * A323728 A323729 A323730

Keyword

nonn

Author

Robin Powell, Jan 25 2019

Status

approved