A018249 - OEIS

A018249

a(n) = prime(2^n)-1.

1, 2, 6, 18, 52, 130, 310, 718, 1618, 3670, 8160, 17862, 38872, 84016, 180502, 386092, 821640, 1742536, 3681130, 7754076, 16290046, 34136028, 71378568, 148948138, 310248240, 645155196, 1339484196, 2777105128, 5750079046, 11891268400, 24563311308, 50685770166, 104484802056

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Amiram Eldar, Table of n, a(n) for n = 0..78

Paul Cooijmans, Numbers, Item 18, 1995.

Paul Cooijmans, Short Test For Genius, Item 29, 2002.

FORMULA

a(n) = A033844(n) - 1.

a(n) = A051440(n) - 2. - Amiram Eldar, Jul 11 2025

MATHEMATICA

Prime[2^Range[0, 30]]-1 (* Harvey P. Dale, Sep 30 2016 *)