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.).

3, 5, 7, 11, 17, 31, 23, 1093, 43, 73, 29, 127, 89, 47

Offset

1,1

Links

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

Example

A237043(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 A356751 A038944

Adjacent sequences: A282629 A282630 A282631 * A282633 A282634 A282635

Keyword

nonn

Author

Robert Price, Feb 19 2017

Status

approved