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A282632 Square root of 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
3, 5, 7, 11, 17, 31, 23, 1093, 43, 73, 29, 127, 89, 47 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

A273043(1)=6, 2^6-1=63, 63=3*3*7, 63 is not squarefree and the square is 3*3=9, the square root being 3.

CROSSREFS

Cf. A237043 , A282631.

Sequence in context: A088083 A116457 A037155 * A212912 A038944 A124081

Adjacent sequences:  A282629 A282630 A282631 * A282633 A282634 A282635

KEYWORD

nonn

AUTHOR

Robert Price, Feb 19 2017

STATUS

approved

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Last modified August 20 03:33 EDT 2019. Contains 326139 sequences. (Running on oeis4.)