Numbers of the form (2^k-1)^2 - 2 that are squarefree.
A381698
Numbers of the form (2^k-1)^2 - 2 that are squarefree.
Terms
- a(0) =7a(1) =47a(2) =223a(3) =959a(4) =3967a(5) =16127a(6) =261119a(7) =1046527a(8) =4190207a(9) =16769023a(10) =67092479a(11) =268402687a(12) =1073676287a(13) =4294836223a(14) =17179607039a(15) =68718952447a(16) =274876858367
External references
- oeis: A381698