OFFSET
1,2
COMMENTS
Each term is odd.
a(10) = 2^617 + 2^529 + 2^527 + 2^401 + 2^352 + 2^284 + 2^240 + 2^239 + 2^154 + 1 has 186 decimal digits. - Max Alekseyev, Feb 04 2018
The sequence is infinite (see AMM links). - Max Alekseyev, Aug 21 2024
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..10
M. A. Alekseyev, Problem 12058, American Mathematical Monthly 125:7 (2018), 660.
A. Stadler, Solution to problem 12058, American Mathematical Monthly 127:3 (2020), 278.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Leroy Quet, Jul 21 2008
EXTENSIONS
First 8 terms calculated by R. J. Mathar and Jack Brennen.
a(9) from Max Alekseyev, Jul 22 2008
STATUS
approved