A081171 Triangle in which n-th row gives trajectory of n (including n itself) under the map x -> x/2 if x is even, x -> 3x-3 if x is odd, stopping when reaching one of 1, 3, 5, 15, 51.

1, 0, 2, 1, 3, 0, 4, 2, 1, 5, 2, 1, 6, 3, 7, 4, 2, 1, 8, 4, 2, 1, 9, 6, 3, 10, 5, 11, 8, 4, 2, 1, 12, 6, 3, 13, 10, 5, 14, 7, 4, 2, 1, 15, 12, 6, 3, 16, 8, 4, 2, 1, 17, 14, 7, 4, 2, 1, 18, 9, 6, 3, 19, 16, 8, 4, 2, 1, 20, 10, 5, 21, 18, 9, 6, 3, 22, 11, 8, 4, 2, 1, 23, 20, 10, 5, 24, 12, 6, 3, 25, 22

Offset: 1

Author

Cino Hilliard, Apr 16 2003

Keywords

• easy
• nonn
• tabf

Crossrefs

Cf. A080825.

Programs

PARI

xn1m3(n) = { for(x=1,n, x1=x; print1(x1" "); while(x1>1, if(x1%2==0,x1/=2,x1=3*x1-3); print1(x1" "); ) ) }