OFFSET
1,1
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
EXAMPLE
15 is in the list since highest odd number in Collatz trajectory of 15 is 53, a prime.
MATHEMATICA
Coll[n_]:=NestWhileList[If[EvenQ[#], #/2, 3*# + 1] &, n, #>1&]; t={}; Do[If[PrimeQ[Max[Select[Coll[n], OddQ]]], AppendTo[t, n]], {n, 1, 300, 2}]; t
PROG
(Haskell)
a225105 n = a225105_list !! (n-1)
a225105_list = filter
((== 1) . a010051' . maximum . filter odd . a070165_row) a005408_list
-- Reinhard Zumkeller, Apr 30 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Jayanta Basu, Apr 28 2013
STATUS
approved