A341231 - OEIS

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A341231

Irregular triangle read by rows giving trajectory from n to reach 1 under the map A245471.

1, 2, 1, 3, 4, 2, 1, 4, 2, 1, 5, 14, 7, 8, 4, 2, 1, 6, 3, 4, 2, 1, 7, 8, 4, 2, 1, 8, 4, 2, 1, 9, 26, 13, 22, 11, 28, 14, 7, 8, 4, 2, 1, 10, 5, 14, 7, 8, 4, 2, 1, 11, 28, 14, 7, 8, 4, 2, 1, 12, 6, 3, 4, 2, 1, 13, 22, 11, 28, 14, 7, 8, 4, 2, 1, 14, 7, 8, 4, 2, 1

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

A340873 gives row lengths.

A341235 gives greatest terms.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..9098 (rows 1..500)

FORMULA

T(n, 1) = n.

T(n, A340873(n)) = 1.

EXAMPLE

Table begins:

2, 1;

3, 4, 2, 1;

4, 2, 1;

5, 14, 7, 8, 4, 2, 1;

6, 3, 4, 2, 1;

7, 8, 4, 2, 1;

8, 4, 2, 1;

9, 26, 13, 22, 11, 28, 14, 7, 8, 4, 2, 1;

10, 5, 14, 7, 8, 4, 2, 1;

11, 28, 14, 7, 8, 4, 2, 1;

12, 6, 3, 4, 2, 1;

13, 22, 11, 28, 14, 7, 8, 4, 2, 1;

14, 7, 8, 4, 2, 1;

15, 16, 8, 4, 2, 1;

16, 8, 4, 2, 1;

...

PROG

(PARI) row(n) = { my (r=[n]); while (n>1, r=concat(r, n=if (n%2, bitxor(n, 2*n+1), n/2))); r }

CROSSREFS

Cf. A070165, A245471, A340873, A341235.

Sequence in context: A352840 A133923 A347296 * A334081 A125158 A273823

Adjacent sequences: A341228 A341229 A341230 * A341232 A341233 A341234

KEYWORD

nonn,base,look,tabf

AUTHOR

Rémy Sigrist, Feb 07 2021

STATUS

approved