1,1
6^6-1=46655=5*7*31*43,
6^6+1=46657=13*37*97
Table of n, a(n) for n=1..25.
Select[Range@42, SquareFreeQ[#^#-1]&&SquareFreeQ[#^#+1]&]
Cf. A005117, A184966, A184967.
Sequence in context: A050584 A019280 A090748 * A032465 A089395 A089699
Adjacent sequences: A188044 A188045 A188046 * A188048 A188049 A188050
nonn
Vladimir Joseph Stephan Orlovsky, Mar 19 2011
a(11)-a(25) from D. S. McNeil, Mar 22 2011
approved
