OFFSET
1,1
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..10000
Christian Elsholtz, Florian Luca, and Stefan Planitzer, Romanov type problems, The Ramanujan Journal 47.2 (2018): 267-289.
MAPLE
q:= n-> ormap(k-> isprime(n-3^k), [$2..ilog[3](n)]):
select(q, [$1..200])[]; # Alois P. Heinz, Feb 14 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 14 2020
STATUS
approved