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A217937
Numbers achieving strength records in 3x+1 problem.
3
1, 63728127, 13371194527, 3743559068799, 100759293214567, 104899295810901231
OFFSET
1,2
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 21 2012
STATUS
approved