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A033478 3x+1 sequence beginning at 3. 12
3, 10, 5, 16, 8, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1, 4, 2, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

C. A. Pickover, The Math Book, Sterling, NY, 2009; see p. 374.

LINKS

Table of n, a(n) for n=0..97.

Index entries for sequences related to 3x+1 (or Collatz) problem

Index entries for linear recurrences with constant coefficients, signature (0, 0, 1).

MAPLE

f:=proc(n) if n mod 2 = 0 then n/2 else 3*n+1; fi; end; g:=proc(n) local i, t1; t1:=[n]; for i from 1 to 120 do t1:=[op(t1), f(t1[nops(t1)])]; od; t1; end; g(3);

CROSSREFS

Sequence in context: A045985 A247034 A035411 * A246777 A111127 A140948

Adjacent sequences:  A033475 A033476 A033477 * A033479 A033480 A033481

KEYWORD

nonn

AUTHOR

Jeff Burch

STATUS

approved

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Last modified August 29 04:48 EDT 2015. Contains 261184 sequences.