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A283092 The smallest square referenced in A280296 (Squarefree numbers n such that 2^n - 1 is divisible by a square > 1). 1
9, 49, 9, 9, 9, 9, 9, 49, 121, 9, 9, 961, 9, 9, 9, 9, 49, 9, 529, 9, 49, 9, 961, 9, 9, 9, 49, 9, 9, 49, 9, 9, 9, 9, 961, 9, 49, 529, 9, 9, 9, 9, 9, 1849, 9, 49, 9, 9, 49, 9, 9, 9, 9, 529, 9, 121, 49, 9, 9, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..60.

EXAMPLE

A280296(1)=6, 2^6-1 = 63 = 3*3*7, so 63 is not squarefree the square being 3*3=9.

CROSSREFS

Cf. A280296, A283245.

Sequence in context: A007037 A179280 A293095 * A249780 A140891 A072461

Adjacent sequences:  A283089 A283090 A283091 * A283093 A283094 A283095

KEYWORD

nonn

AUTHOR

Robert Price, Mar 06 2017

STATUS

approved

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Last modified April 20 09:03 EDT 2019. Contains 322307 sequences. (Running on oeis4.)