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

Author

N. J. A. Sloane, May 16 2005

Keywords

• nonn

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.

Crossrefs

Cf. A106749.

Programs

Mathematica

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

Extensions

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