A051157 a(n) = (2^p^3 - 1)/(2^p^2 - 1) where p = n-th prime.

17, 262657, 1267650638007162390353805312001, 31828687130226401637050536789795514059715404495050094614691019248562308626412218127220737

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Crossrefs

Cf. A051154, A051155, A051156.

Programs

Mathematica

Table[(2^Prime[n]^3 - 1)/(2^Prime[n]^2 - 1),{n,4}] (* Stefano Spezia, Dec 23 2022 *)