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A135729
Record indices of A135727(n)/n = max{ A001281^k(n);k=0,1,2,3... }/n (3x-1 problem).
3
1, 3, 5, 9, 17, 65, 129, 153, 321, 1889, 4097, 10497, 11025, 28161, 149345, 558341, 1467393, 75567105, 299480577, 344371457, 677585217, 788620517, 1951587609, 2672464025, 15958182629, 52002133905, 187559691777, 213121397657
OFFSET
1,2
COMMENTS
This subsequence of A135728 gives indices n for which A135727(n)/n (ratio of maximal value to starting value) is larger than for all preceding indices. Obviously, we cannot consider the index n=0 here.
PROG
(PARI) A135729(Nmax=10^5)=local(m=0); for(n=1, Nmax, if(m+0<m=max(m, A135727(n)/n), print1(n", ")))
KEYWORD
nonn
AUTHOR
M. F. Hasler, Nov 26 2007
EXTENSIONS
a(15)-a(28) from Donovan Johnson, Nov 06 2010
STATUS
approved