OFFSET
0,1
COMMENTS
The sequence is bounded, namely {a(n)} = {3, 5, 7}, because one of the numbers 2^n + 3, 2^n + 5, 2^n + 7 is divisible by 3. - Thomas Ordowski, Apr 11 2019
LINKS
Amiram Eldar, Table of n, a(n) for n = 0..10000
EXAMPLE
A000079(20) + a(20) = 1048576 + 3 = 1048579 = 7*163*919.
MATHEMATICA
Table[p := 2; While[PrimeQ[2^n + Prime[p]], p++ ]; Prime[p], {n, 0, 150}] (* Stefan Steinerberger, Mar 28 2006 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Mar 27 2006
EXTENSIONS
More terms from Stefan Steinerberger, Mar 28 2006
STATUS
approved