A063042 - OEIS

A063042

Collatz-2 (A063041) trajectory starting at 3.

3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9, 3, 7, 36, 18, 9

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

OFFSET

0,1

COMMENTS

a(0) = a(5) = 3

LINKS

Table of n, a(n) for n=0..104.

FORMULA

a(0) = 3 and a(n) = A063041(a(n-1)) for n > 0

MATHEMATICA

NestList[If[PrimeQ[#], #*Prime[PrimePi[#]-1]+1, #/Min@@First/@FactorInteger[#]]&, 3, 104] (* Jayanta Basu, May 27 2013 *)

CROSSREFS