1,2

Jacques Basaldua, All Fermat and Mersenne numbers are squarefree..

Do[ If[ PrimeQ[2^(2n - 1) + 2^n + 1], Print[n]], {n, 5500}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 03 2005)

A006599(n)=a(n)-1.

Sequence in context: A055789 A048681 A051891 this_sequence A075623 A024801 A101277

Adjacent sequences: A108059 A108060 A108061 this_sequence A108063 A108064 A108065

base,nonn

Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), Jun 02 2005

a(1) and a(12) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 03 2005