A066652 Primes of the form 2*s - 1, where s is a squarefree number (A005117).

3, 5, 11, 13, 19, 29, 37, 41, 43, 59, 61, 67, 73, 83, 101, 109, 113, 131, 137, 139, 157, 163, 173, 181, 193, 211, 227, 229, 257, 277, 281, 283, 307, 313, 317, 331, 347, 353, 373, 379, 389, 397, 401, 409, 419, 421, 433, 443, 457

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Example

a(10) = A000040(17) = 59 = 2*30-1 = 2*A005117(19)-1.

Mathematica

Select[2 * Select[Range[200], SquareFreeQ] - 1, PrimeQ] (* Amiram Eldar, Feb 22 2021 *)

Crossrefs

Cf. A005383, A066651, A066653.

Sequence in context: A151917 A059639 A059263 * A165354 A059638 A059265

Adjacent sequences: A066649 A066650 A066651 * A066653 A066654 A066655

Keyword

nonn

Author

Reinhard Zumkeller, Jan 10 2002

Status

approved