OFFSET
1,7
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..1000
MATHEMATICA
Collatz[a0_Integer, maxits_: 1000] := NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, a0, Unequal[#, 1, -1, -10, -34] &, 1, maxits]; (*Collatz[n] function definition by Eric Weisstein*) A025586[m_] :=
Flatten[Table[Take[Sort[Collatz[n], Greater], 1], {n, m}]];
PrimeNu[A025586[100]] (* G. C. Greubel, Apr 24 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Sep 25 2003
STATUS
approved