A106748 Define the morphism f: 1->113, 2->13, 3->2 and let a(0) = 1; then a(n+1) = f(a(n)).

1, 113, 1131132, 1131132113113213, 113113211311321311311321131132131132, 113113211311321311311321131132131132113113211311321311311321131132131132113113213

Offset

0,2

References

E. Bombieri and J. Taylor, Which distribution of matter diffracts? An initial investigation, in International Workshop on Aperiodic Crystals (Les Houches, 1986), J. de Physique, Colloq. C3, 47 (1986), C3-19 to C3-28.

Links

Table of n, a(n) for n=0..5.

Mathematica

FromDigits /@ NestList[ Flatten[ # /. {1 -> {1, 1, 3}, 2 -> {1, 3}, 3 -> 2}] &, {1}, 5] (* Robert G. Wilson v, May 17 2005 *)

Crossrefs

Cf. A106749.

Sequence in context: A329105 A304324 A180052 * A220983 A122503 A076150

Adjacent sequences: A106745 A106746 A106747 * A106749 A106750 A106751

Keyword

nonn

Author

N. J. A. Sloane, May 16 2005

Extensions

More terms from Robert G. Wilson v, May 17 2005

Status

approved