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

1,3

Links

Table of n, a(n) for n=1..92.

Prog

(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" "); ) ) }

Crossrefs

Cf. A080825.

Sequence in context: A246024 A278529 A160588 * A334594 A359336 A062778

Adjacent sequences: A081168 A081169 A081170 * A081172 A081173 A081174

Keyword

easy,nonn,tabf

Author

Cino Hilliard, Apr 16 2003

Status

approved