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A138846 Triangle read by rows: T(n,k) = A092892(n-k) if k <= n, 0 otherwise. 1
1, 2, 1, 4, 2, 1, 8, 4, 2, 1, 5, 8, 4, 2, 1, 3, 5, 8, 4, 2, 1, 6, 3, 5, 8, 4, 2, 1, 12, 6, 3, 5, 8, 4, 2, 1, 24, 12, 6, 3, 5, 8, 4, 2, 1, 17, 26, 13, 20, 10, 5, 8, 4, 2, 1, 11, 17, 26, 13, 20, 10, 5, 8, 4, 2, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A Collatz triangle.

T(n,n) is first occurrence of 1 in n steps, ordered on lowest starting value.

LINKS

Table of n, a(n) for n=0..65.

Eric Weisstein's World of Mathematics, Collatz Problem.

EXAMPLE

Triangle begins

   1;

   2,  1;

   4,  2,  1;

   8,  4,  2,  1;

   5,  8,  4,  2,  1;

   3,  5,  8,  4,  2,  1;

   6,  3,  5,  8,  4,  2,  1;

  12,  6,  3,  5,  8,  4,  2,  1;

  24, 12,  6,  3,  5,  8,  4,  2,  1;

  17, 26, 13, 20, 10,  5,  8,  4,  2,  1;

  11, 17, 26, 13, 20, 10,  5,  8,  4,  2,  1;

CROSSREFS

Sequence in context: A091918 A177953 A138895 * A235670 A130321 A101508

Adjacent sequences:  A138843 A138844 A138845 * A138847 A138848 A138849

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry, Mar 31 2008, Apr 02 2008

STATUS

approved

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Last modified January 19 00:40 EST 2020. Contains 331030 sequences. (Running on oeis4.)