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A282631
The smallest square referenced in A237043 (Numbers n such that 2^n - 1 is not squarefree, but 2^d - 1 is squarefree for every proper divisor d of n.).
2
9, 25, 49, 121, 289, 961, 529, 1194649, 1849, 5329, 841, 16129, 7921, 2209
OFFSET
1,1
EXAMPLE
A237043(1)=6, 2^6-1=63, 63=3*3*7, 63 is not squarefree and the square is 3*3=9.
CROSSREFS
Sequence in context: A110284 A109367 A110588 * A245694 A045972 A297596
KEYWORD
nonn,more
AUTHOR
Robert Price, Feb 19 2017
STATUS
approved