A076701 Values of n not reached in the Hofstadter sequence (A005185).

7, 13, 15, 18, 27, 29, 34, 36, 49, 51, 59, 67, 70, 74, 81, 89, 95, 97, 98, 99, 102, 103, 117, 126, 127, 131, 134, 141, 142, 145, 150, 158, 163, 166, 181, 183, 189, 191, 195, 197, 198, 199, 205, 207, 209, 213, 224, 225, 232, 247, 259, 265, 267, 270, 274, 281

Offset

1,1

Comments

For any n, there is no solution to a(n) = A005185(x). Does lim_{n -> infinity} a(n)/n exist?

Plotting a(n)/n for the first 6 billion terms, it appears to be converging to ~7.39. - Benjamin Chaffin, Sep 17 2019

Links

Benjamin Chaffin, Table of n, a(n) for n = 1..13805

Benjamin Chaffin, Log scale plot of a(n)/n from 1 .. 6*10^9

Benjamin Chaffin, Log scale plot of a(n)/n from 1000000 .. 6*10^9

Mathematica

a[1] = a[2] = 1; a[n_] := a[n] = a[n - a[n - 1]] + a[n - a[n - 2]]; t = Table[a[n], {n, 1000}]; Take[ Complement[ Range@ 502, Union@ t], 56]

Crossrefs

Cf. A005185.

Sequence in context: A191976 A380604 A135054 * A224773 A349749 A076196

Adjacent sequences: A076698 A076699 A076700 * A076702 A076703 A076704

Keyword

nonn

Author

Benoit Cloitre, Oct 26 2002

Status

approved