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

17, 262657, 1267650638007162390353805312001, 31828687130226401637050536789795514059715404495050094614691019248562308626412218127220737

Offset

1,1

Links

Table of n, a(n) for n=1..4.

Mathematica

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

Crossrefs

Cf. A051154, A051155, A051156.

Sequence in context: A269442 A203677 A099499 * A177918 A297488 A177816

Adjacent sequences: A051154 A051155 A051156 * A051158 A051159 A051160

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved